

A322946


Numbers k such that 311*2^k+1 is prime.


0



9, 29, 35, 105, 125, 131, 179, 359, 2735, 28199, 47349, 64485, 1094135, 1171199, 1323071, 2798459
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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[311*2^# + 1] &] (* Robert Price, Dec 31 2018 *)


CROSSREFS

Cf. A002255, A050527.
Sequence in context: A044976 A002642 A032700 * A098949 A031296 A146869
Adjacent sequences: A322943 A322944 A322945 * A322947 A322948 A322949


KEYWORD

nonn,more,hard


AUTHOR

Robert Price, Dec 31 2018


EXTENSIONS

a(16) from Jeppe Stig Nielsen, Dec 27 2019


STATUS

approved



