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A032371 Numbers k such that 43*2^k+1 is prime. 1

%I #30 Jan 18 2020 11:00:46

%S 2,6,12,18,26,32,94,98,104,144,158,252,778,1076,2974,3022,3528,4344,

%T 5322,10416,10422,29862,33526,163354,167618,175542,217584,762212,

%U 835934,894766,1087992,1235298,1795628,1799016,2795582,2994958,3063674

%N Numbers k such that 43*2^k+1 is prime.

%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 Ray Ballinger, <a href="http://www.prothsearch.com/index.html">Proth Search Page</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(43*2^n+1) \\ _Charles R Greathouse IV_, Jun 12 2017

%K nonn

%O 1,1

%A _James R. Buddenhagen_

%E More terms from _Hugo Pfoertner_, Jun 20 2003

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

%E a(35)-a(37) from _Jeppe Stig Nielsen_, Jan 18 2020

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Last modified May 13 09:15 EDT 2024. Contains 372503 sequences. (Running on oeis4.)