The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A032457 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
newer changes | Showing entries 11-20 | older changes

A032457

Numbers k such that 161*2^k+1 is prime.
(history; published version)

#22 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

#21 by Alois P. Heinz at Tue Dec 18 15:07:56 EST 2018

STATUS

proposed

approved

#20 by Robert Price at Tue Dec 18 14:55:28 EST 2018

STATUS

editing

proposed

#19 by Robert Price at Tue Dec 18 14:55:09 EST 2018

NAME

Numbers n k such that 161*2^nk+1 is prime.

DATA

3, 5, 11, 13, 51, 53, 63, 71, 103, 179, 205, 267, 351, 589, 719, 1453, 3703, 7935, 10851, 15151, 16013, 20319, 65475, 66083, 105269, 181059, 186347, 319875, 1057743, 1668927, 1754223

MATHEMATICA

Select[Range[1000], PrimeQ[161*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)

KEYWORD

nonn,hard,changed,more

EXTENSIONS

a(25)-a(31) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 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

#16 by N. J. A. Sloane at Wed Dec 12 07:49:59 EST 2018

LINKS

Ray Ballinger, <a href="http://web.archive.org/web/20160604135248/http://www.prothsearch.netcom/index.html">Proth Search Page</a>

Discussion

Wed Dec 12

07:49

OEIS Server: https://oeis.org/edit/global/2775

#15 by Charles R Greathouse IV at Tue Jun 13 10:59:47 EDT 2017

STATUS

editing

approved

#14 by Charles R Greathouse IV at Tue Jun 13 10:59:40 EDT 2017

PROG

(PARI) is(n)=ispseudoprime(161*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

STATUS

approved

editing

#13 by N. J. A. Sloane at Thu Mar 02 11:43:35 EST 2017

LINKS

Ray Ballinger, <a href="http://web.archive.org/web/20160604135248/http://www.prothsearch.net/index.html">Proth Search Page</a>

Discussion

Thu Mar 02

11:43

OEIS Server: https://oeis.org/edit/global/2611