Streamlight Ultra Stinger Made in Eagleville, Pennsylvania USAPrime numbers are normally positive natural numbers that can be divided by only either 1 (one) or itself without generating any fractions except 1 (one) itself like 2, 3, 5, 7, 11, 13, 17 and so on. Other integers are composite numbers that can be expressed as multiplied numbers with two or more prime numbers.
Pretty basic, right?
2 is the only prime that is even. Otherwise only odd numbers can be prime numbers.
For example, these are prime numbers.
101 = 1 x 101
103 = 1 x 103
113 = 1 x 113
Where as, these are composite numbers.
111 = 3 x 37
121 = 11 x 11
123 = 3 x 41
1,111 = 11 x 101
111,111 = 3 x 7 x 11 x 13 x 37
composite number = prime number x prime number x ..
There are many kinds of prime numbers like twin prime numbers (separated by two like 3 and 5 or 11 and 13). (https://en.wikipedia.org/wiki/Category:Classes_of_prime_numbers)
There are Mersenne prime numbers (those that can be expressed as 2&supn; - 1). Some of the resulting numbers are prime numbers.
For example,
2² - 1 = 4 - 1 = 3 (Mersenne prime)
2³ - 1 = 8 - 1 = 7 (Mersenne prime)
2 to the power of 4 - 1 = 16 - 1 = 15 (not prime)
2 to the power of 5 - 1 = 32 - 1 = 31 (Mersenne prime)
2 to the power of 6 - 1 = 64 - 1 = 63 (not prime)
2 to the power of 7 - 1 = 128 - 1 = 127 (Mersenne prime)
There is a list of various types of prime numbers there on this Wikipedia page. I found there was no entry of Grothendick prime numbers. I was a bit disappointment to me. Instead, I found it on a separate entry for number 57. There was a paragraph for the Grothendick prime number. By the way, 57 = 3 x 19. Then why is 57 called Grothendick prime number? There's a very funny story you will find behind it if you properly search it on the Internet.
(https://en.wikipedia.org/wiki/57_(number))
Anyway, there is a line mentioning "palindromic prime" there on the page above (like 11, 101 and so on). That is what I am talking about here in this entry.
My prized (not in terms of its value but my sentimental attachment to it) Streamlight Ultra Stinger that I obtained from (I believe) Texas, USA sold on eBay. I got it because it was not too expensive and its serial number (#93139) was clearly visible on the seller's description.
It is battered (left the factory between 2001 to 2015? when they introduced new LED Ultra Stingers) but not so badly. Streamlight relocated its factory (or headquarter office) to Eagleville after 2001.
Its (supposedly) poly-carbonate lens has more damages than other parts of the body. Extreme heat from the filament bulb caused the deformation (a very small protrusion in the very center that the focused light could have melted the material) and years of use left those scars.
I once researched if it was possible to replace the lens by myself easily. There were replacement lens sold but it seemed this required a special tool.
I like this Ultra Stinger and thought about getting an upgrade for it, namely a Lumens Factory emitter upgrade. Should I get it? I would really love to get that lens replaced if I was going to get that emitter upgrade. I also know that this lens replacement would cost me more time and more money.
There are some close encounter with two twin prime number serial Stingers. I found two alone twin prime Stingers sold as a lot. I did not get them. Way out of my reach. Not even thought of betting.
(http://teamcsc.blog93.fc2.com/blog-entry-2965.html)
I would love to get a complete set of twins one day. Maybe? I don't think I will be lucky enough to get twins.
In Japanese:続きをどうぞ
[I love prime numbers]の続きを読む
テーマ:日記 - ジャンル:日記
- 2024/09/06(金) 23:47:47|
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A second consecutive loss for meThe ebay Brompton purchase was just another (as I had already had one) scam. I reported the matter to ebay and the refund process began promptly after my complaint).
That was Saturday afternoon.
Friday (one day before this revelation) I found 3 listings from Austria similar Bromptons with similar prices with the same "Buy it now" option. The similarities don't stop there. The account names are also similar. Seemingly 4 (or 5) random alphabet letters followed by 5 or 6 digits of numbers. Their selling record shows "zero" transactions at all and they have just recently joined ebay. Are they all done by one person or a group of perpetrators?
I am disappointed and mad but it is ebay's responsibility to stop them. Stop those criminals!
In Japanese: 続きをどうぞ
[A lot of scams? on ebay]の続きを読む
テーマ:海外情報 - ジャンル:海外情報
- 2023/11/16(木) 13:18:23|
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Mag Instrument Mag-Lite 4C and Streamlight Ultra StingerI acquired an old battered Mag-Lite 4C about two years ago. I did not buy it. I got it for free. I found it lying on a shelf (free of charge) at a local recycling center where I worked at that time.
I did not think much of it until recently. I got fascinated by it when I learned that it had been over manufactured 32 years before. It was until recently that I knew it was at least 32 years old.
I like the shape of Mag-Lite 4C. A C-cell battery is sized at 26 millimeters in diameter and 50 millimeters in length while a D-cell battery is sized at 33.2 millimeters and 61.5 millimeters respectively.
A 4C has a much thinner body than a typical D-cell Mag-Lite does. I like this thinner shape.
Streamlight UltraStinger looks much like Mag-Lite 4C. They are about the same in their dimension.
Now I am looking for a good deal on Streamlight UltraStinger on ebay. I am looking for the old incandescent bulb model but not a newer model with an LED. Most of them (if not all) are from the United States of America where Streamlight operates but they are made in China nowadays anyway.
It has to be cheap as the shipping fee is exorbitant because the shipment is handled by UPS, Fedex or others who are very quick but charge a lot in return.
To add insult to injury, we have to pay additional so-called import charges in proportion to the price I pay for the item when something is brought into EU from outside EU. Outrageous!
Amazon Germany does not have many Streamlight products but Amazon UK has slightly more for some reasons.
Once I decide to get a secondhand Streamlight UltraStinger, I have to be very careful not to overpay for them. Most cheap used UltraStinger do not come with chargers or even rechargeable batteries. If I am going to buy chargers or batteries additionally, the total price will be more than or as much as a new LED UltraStinger that could be obtained from Amazon Germany or Amazon UK. I don't want to be stupid shopper.
I am not going to buy the genuine part charger nor genuine part batteries. I have to devise a way to put the 18650 batteries into it to power up the flashlight.
Am I going to get a third-party LED upgrade such as by Lumens Factory (lumensfactory.com)? It is an interesting product but I don't think I am going to jump on it soon.
In Japanese: 続きをどうぞ
[Do I need a Streamlight Ultra Stinger?]の続きを読む
テーマ:アウトドア - ジャンル:趣味・実用
- 2023/03/22(水) 19:58:52|
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So-called and maybe totally baseless theory?Johannes "Hans" Friedrich Leopold von Seeckt, according to the Wikipedia (in English) is an accomplished German soldier (very high-ranking) and later a military consultant.
I did not know his name or if he had existed until recently. Who does?
For some reasons unknown or obscure, his name along with his theory (or his thoughts) on how to use certain types of people in particular places in the army is very well known in Japan. Why Japan? Please don't ask me!
According to this bogus baseless (?) theory, you can choose how to deploy certain people in the army (or in any organizations like companies or so).
When I came to knew this so-called Seeckt theory, I wanted to know the whole story on it so I sought for the source. English version of Wikipedia did not. It did not mention this theory at all.
I learned soon from a Japanese web page (some kind of online dictionary of contemporary terms that this theory did not really had any solid source at all. Someone attributed this theory to his name contending that Herr von Seeckt had said so somewhere.
Anyway, writing something without any solid source on Wikipedia is a no-no and that was why I did not find this theory there (Wikipedia - von Seeckt's entry in English).
It was strange to find an old German officer's name in a wide-spread Japanese myth. Who started it?
Yet this bogus theory was so convincing in a way and many people (Japanese people at least) are using it as a base for some arguments.
In essence, the theory goes like this. You can roughly categorize people in four kinds and there are right positions for those 4 types of solders. This below is my own translation from some of the Japanese writings so I can not take any credits nor criticism.
1. Able and eager (or too eager)
2. Able but lazy (in such a way that might be understood not too eager)
3. Incapable (or not able) but eager (or too eager)
4. Incapable (or not able) and lazy (In such a way that might be understood not too eager)
A person of trait number 1 should be officers who take orders from the higher-ranking officer.
A person of trait number 2 should be the top officer.
A person of trait number 3 should be executed by a firing squad. Totally useless!
A person of trait number 4 should be a lower-ranking soldier.
Does this make any sense at all? At least many Japanese think so.
In Japanese: 続きをどうぞ
[Hans Seeckt (A German Soldier) and his "supposed" thoughts on people]の続きを読む
テーマ:ひとりごとのようなもの - ジャンル:日記
- 2023/02/02(木) 22:21:15|
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C cell Mag-Lites are gone!I was looking for some information concerning Mag-Lites upgrades and reached a blog site by someone who obviously a Mag-Lite mania (in a respectful way, of course).
In one of his blog entries I learned that Mag-Lite (the manufacturer) discontinued the C cell line completely back in 2020. This means that the C cell Mag-Lite flashlights that I find on sale (on Amazon or elsewhere) are already dead stock products. There will be no new ones leaving the assembly line. How sad!
This fact gave me one more reason to like my own Mag-Lite 4 C. There will be no more! Should I start buying some parts for it while there are available? I would not but ...
I was wondering for a while how it was possible that the Mag-Lite flashlights sold on Amazon Germany had a very wide price range. Simple 2 D flashlights seemed to be have a stable price zone while others had extreme high price tags.
I have to assume that those (for example 6 D maybe?) are already dropped from the production line.
I was also wondering before I learned the dwindling production of Mag-Lite flashlights why those drop-in LED upgrades are not so actively sold. Some upgrade makers did not have any stocks.
I have to guess that even upgrade makers have lost faith in the (Mag-Lite) market.
Sad! Years from now those Mag-Lite flashlights will be sold at a very high price among collectors. I do not intend to buy Mag-Lite flashlights to sell them for profit later years from now but I would keep my eyes on ones available now.
I used to own 6 D that I purchased in Germany more than 10 years ago. It was on sale and had a price tag of 50 % off at that time. I guess it was only around 20 Euros or something. I don't own it now and I regret having bequeathed it.
In Japanese: 続きをどうぞ
[Additionally Mag-Lites]の続きを読む
テーマ:ひとりごとのようなもの - ジャンル:日記
- 2023/02/01(水) 22:03:56|
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