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%I #4 Jan 03 2019 13:27:52
%S 5,11,23,41,221,485,839,3029,6479,15455,16715,38399,38525,38645,
%T 167501,185571,505679,649445,764369,797849,1106091,1309751,1447971,
%U 1480715,1538975
%N Numbers k such that 395*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[395*2^# + 1] &] (* _Robert Price_, Jan 03 2019 *)
%K nonn,more,hard
%O 1,1
%A _Robert Price_, Jan 03 2019
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