The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A063982

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A063982

Number of divisors of 2^n - 1 that are relatively prime to 2^m - 1 for all 0 < m < n.
(history; published version)

#43 by N. J. A. Sloane at Mon Apr 22 15:21:57 EDT 2019

STATUS

proposed

approved

#42 by Jon E. Schoenfield at Sun Apr 21 00:59:42 EDT 2019

STATUS

editing

proposed

#41 by Jon E. Schoenfield at Sun Apr 21 00:59:40 EDT 2019

COMMENTS

a(n) is the number of divisors of A064078(n), . - Jianing Song, Apr 20 2019

STATUS

proposed

editing

#40 by Jianing Song at Sat Apr 20 12:22:10 EDT 2019

STATUS

editing

proposed

#39 by Jianing Song at Sat Apr 20 12:21:51 EDT 2019

COMMENTS

a(n) is the number of divisors of A064078(n), - Jianing Song, Apr 20 2019

STATUS

approved

editing

Discussion

Sat Apr 20

12:22

Jianing Song: To make the definition clearer.

#38 by N. J. A. Sloane at Fri Jan 18 13:55:40 EST 2019

LINKS

Sam Wagstaff, <a href="https://homes.cerias.purdue.edu/~ssw/cun/pmain1017">Factorizations of 2^n-1, n odd, n<1200</a>, Cunningham Project.

Discussion

Fri Jan 18

13:55

OEIS Server: https://oeis.org/edit/global/2796

#37 by OEIS Server at Thu May 03 08:56:31 EDT 2018

LINKS

Jianing Song, <a href="/A063982/b063982_5.txt">Table of n, a(n) for n = 1..500</a> (Terms 1 through 250 from Reinhard Zumkeller)

#36 by Alois P. Heinz at Thu May 03 08:56:31 EDT 2018

STATUS

proposed

approved

Discussion

Thu May 03

08:56

OEIS Server: Installed new b-file as b063982.txt.  Old b-file is now b063982_5.txt.

#35 by Jianing Song at Thu May 03 05:03:44 EDT 2018

STATUS

editing

proposed

Discussion

Thu May 03

07:09

Alois P. Heinz: Why is there a 4th and a 5th version, all with the same number of terms?

07:45

Jianing Song: I made a mistake by saying a(486) = 32, but actually a(486) = 16

08:56

Alois P. Heinz: ok, thanks.

#34 by Jianing Song at Thu May 03 05:02:55 EDT 2018

LINKS

Jianing Song, <a href="/A063982/b063982_5.txt">Table of n, a(n) for n = 1..500</a> (Terms 1 through 250 from Reinhard Zumkeller)