The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A032502 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A032502

Numbers k such that 251*2^k+1 is prime.
(history; published version)

#26 by Alois P. Heinz at Tue Feb 25 18:26:07 EST 2020

STATUS

proposed

approved

#25 by Jeppe Stig Nielsen at Tue Feb 25 17:57:51 EST 2020

STATUS

editing

proposed

#24 by Jeppe Stig Nielsen at Tue Feb 25 17:57:39 EST 2020

DATA

1, 11, 13, 17, 35, 77, 155, 325, 4097, 5471, 7151, 7561, 9211, 13535, 14627, 18361, 21815, 41945, 68255, 105947, 119915, 358777, 748745, 843367, 1171193, 2730917

EXTENSIONS

a(26) from Jeppe Stig Nielsen, Feb 25 2020

STATUS

approved

editing

#23 by N. J. A. Sloane at Thu Dec 20 14:03:04 EST 2018

LINKS

Ray Ballinger and Wilfrid Keller, <a href="http://www.prothsearch.com/rieselriesel1.html">List of primes k.2^n + 1 for k < 300</a>

Discussion

Thu Dec 20

14:03

OEIS Server: https://oeis.org/edit/global/2778

#22 by Bruno Berselli at Thu Dec 20 10:33:02 EST 2018

STATUS

proposed

approved

#21 by Robert Price at Thu Dec 20 10:20:42 EST 2018

STATUS

editing

proposed

#20 by Robert Price at Thu Dec 20 10:20:32 EST 2018

KEYWORD

nonn,hard,,more,changed

#19 by Robert Price at Thu Dec 20 10:20:17 EST 2018

NAME

Numbers n k such that 251*2^nk+1 is prime.

DATA

1, 11, 13, 17, 35, 77, 155, 325, 4097, 5471, 7151, 7561, 9211, 13535, 14627, 18361, 21815, 41945, 68255, 105947, 119915, 358777, 748745, 843367, 1171193

MATHEMATICA

Select[Range[1000], PrimeQ[251*2^# + 1] & ] (* Robert Price, Dec 20 2018 *)

KEYWORD

nonn,hard,changed,,more

EXTENSIONS

a(21)-a(25) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 20 2018

STATUS

approved

editing

#18 by N. J. A. Sloane at Thu Dec 13 17:03:42 EST 2018

LINKS

Ray Ballinger and Wilfrid Keller, <a href="http://web.archive.org/web/20161028080239/http://www.prothsearch.netcom/riesel.html">List of primes k.2^n + 1 for k < 300</a>

Discussion

Thu Dec 13

17:03

OEIS Server: https://oeis.org/edit/global/2777

#17 by N. J. A. Sloane at Wed Dec 12 07:58:05 EST 2018

LINKS

Wilfrid Keller, <a href="http://web.archive.org/web/20161028021640/http://www.prothsearch.netcom/riesel2.html">List of primes k.2^n - 1 for k < 300</a>

Discussion

Wed Dec 12

07:58

OEIS Server: https://oeis.org/edit/global/2776