A032401 - OEIS

%I #32 Apr 20 2020 02:20:21

%S 16,18,30,40,58,138,250,616,622,736,3670,6550,8454,12418,18520,21762,

%T 26704,103048,109888,131394,419416,1001214,2093350,2128242,2234536

%N Numbers k such that 103*2^k+1 is prime.

%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(103*2^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017

%K nonn

%O 1,1

%A _James R. Buddenhagen_

%E Extended by _Hugo Pfoertner_, Jul 02 2003

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

%E a(23) from http://www.prothsearch.com/riesel1.html by _Robert Price_, Dec 14 2018

%E a(24)-a(25) from _Jeppe Stig Nielsen_, Apr 19 2020