A323002 - OEIS

%I #4 Jan 02 2019 07:39:33

%S 6,12,24,34,46,138,174,816,1164,1668,1704,5334,10126,11340,13818,

%T 18564,82968,202986,241368,285492,1482390

%N Numbers k such that 355*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/riesel1a.html">List of primes k.2^n + 1 for 300 < k < 600</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 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ProthPrime.html">Proth Prime</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>

%t Select[Range[1000], PrimeQ[355*2^# + 1] &] (* _Robert Price_, Jan 01 2019 *)

%K nonn,more,hard

%O 1,1

%A _Robert Price_, Jan 01 2019