

A322950


Numbers k such that 317*2^k+1 is prime.


0



7, 11, 243, 291, 327, 1211, 7331, 26775, 101603, 171071, 284795, 295195, 323871, 589755, 833467, 1047471
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..16.
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600
Y. Gallot, Proth.exe: Windows Program for Finding Large Primes
Wilfrid Keller, List of primes k.2^n  1 for k < 300
Eric Weisstein's World of Mathematics, Proth Prime
Index entries for sequences of n such that k*2^n1 (or k*2^n+1) is prime


MATHEMATICA

Select[Range[1000], PrimeQ[317*2^# + 1] &] (* Robert Price, Dec 31 2018 *)


CROSSREFS

Cf. A002255,A050527.
Sequence in context: A292791 A106818 A231329 * A201120 A164328 A301736
Adjacent sequences: A322947 A322948 A322949 * A322951 A322952 A322953


KEYWORD

nonn,more,hard


AUTHOR

Robert Price, Dec 31 2018


STATUS

approved



