The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A120804

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Showing entries 1-10 | older changes

A120804

Primes with consecutive digits descending.
(history; published version)

#12 by Michael De Vlieger at Fri Aug 05 15:35:03 EDT 2022

STATUS

reviewed

approved

#11 by Michel Marcus at Fri Aug 05 13:38:16 EDT 2022

STATUS

proposed

reviewed

#10 by Michael S. Branicky at Fri Aug 05 13:37:16 EDT 2022

STATUS

editing

proposed

#9 by Michael S. Branicky at Fri Aug 05 13:37:14 EDT 2022

COMMENTS

a(15) has 1053 digits. - Michael S. Branicky, Aug 05 2022

PROG

(Python)

from sympy import isprime

from itertools import count, islice

def bgen(): yield from (int("".join(str((s0-i)%10) for i in range(d))) for d in count(1) for s0 in range(1, 10))

def agen(): yield from filter(isprime, bgen())

print(list(islice(agen(), 10))) # Michael S. Branicky, Aug 05 2022

STATUS

approved

editing

#8 by Charles R Greathouse IV at Wed May 08 09:54:59 EDT 2013

STATUS

editing

approved

#7 by Charles R Greathouse IV at Wed May 08 09:53:25 EDT 2013

DATA

2, 3, 5, 7, 43, 109, 10987, 76543, 10987654321098765432109876543210987, 4321098765432109876543210987654321098765432109876543210987654321, 1098765432109876543210987654321098765432109876543210987654321098765432109876543210987654321098765432109876543210987654321098765432109876543

Discussion

Wed May 08

09:54

Charles R Greathouse IV: Thanks for fixing this.

#6 by Charles R Greathouse IV at Wed May 08 09:53:05 EDT 2013

EXTENSIONS

Corrected by Paul Tek, May 08 2013

STATUS

proposed

editing

#5 by Paul Tek at Wed May 08 07:16:03 EDT 2013

STATUS

editing

proposed

#4 by Paul Tek at Wed May 08 07:14:50 EDT 2013

DATA

2, 3, 5, 7, 43, 109, 10987, 76543, 10987654321098765432109876543210987, 4321098765432109876543210987654321098765432109876543210987654321, 432109876543210987654321098765432109876543210987654321098765432109876543210987654321098765432109876543210987654321098765432109876543210987654321098765432109876543210987654321091098765432109876543210987654321098765432109876543210987654321098765432109876543210987654321098765432109876543210987654321098765432109876543

LINKS

Paul Tek, <a href="/A120804/b120804.txt">Table of n, a(n) for n = 1..14</a>

STATUS

approved

editing

Discussion

Wed May 08

07:15

Paul Tek: Terms with a leading 1 where missing.

#3 by Russ Cox at Fri Mar 30 17:31:20 EDT 2012

AUTHOR

_Robert G. Wilson v (rgwv(AT)rgwv.com), _, Jul 05 2006

Discussion

Fri Mar 30

17:31

OEIS Server: https://oeis.org/edit/global/156