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Numbers k such that 65*2^k+1 is prime.
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%I #35 Dec 22 2024 20:22:35

%S 1,3,5,11,17,21,29,47,85,93,129,151,205,239,257,271,307,351,397,479,

%T 553,1317,1631,1737,1859,1917,1999,2353,3477,4331,4337,5809,8707,9649,

%U 10421,11117,17425,18343,20791,21035,28331,34249,45029,73237,84839,106515

%N Numbers k such that 65*2^k+1 is prime.

%H Jeppe Stig Nielsen, <a href="/A032382/b032382.txt">Table of n, a(n) for n = 1..70</a>

%H Ray Ballinger, <a href="http://www.prothsearch.com/index.html">Proth Search Page</a>

%H Ray Ballinger and Wilfrid Keller, <a href="http://www.prothsearch.com/riesel1.html">List of primes k.2^n + 1 for k < 300</a>

%H Y. Gallot, <a href="http://www.utm.edu/research/primes/programs/gallot/index.html">Proth.exe: Windows Program for Finding Large Primes</a>

%H Wilfrid Keller, <a href="http://www.prothsearch.com/riesel2.html">List of primes k.2^n - 1 for k < 300</a>

%H <a href="/index/Pri#riesel">Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime</a>

%o (PARI) is(n)=ispseudoprime(65*2^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017

%K nonn

%O 1,2

%A _James R. Buddenhagen_

%E More terms (from http://web.archive.org/web/20161028080239/http://www.prothsearch.net/riesel.html), _Joerg Arndt_, Apr 07 2013

%E a(66) from http://www.prothsearch.com/riesel1.html by _Robert Price_, Dec 14 2018

%E Terms moved from Data section to b-file, and more terms appended to b-file, by _Jeppe Stig Nielsen_, Jan 18 2020