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 A323144 Numbers k such that 309*2^k+1 is prime. 1
 1, 2, 3, 6, 9, 21, 51, 53, 57, 67, 69, 106, 143, 163, 193, 194, 231, 338, 343, 1197, 1314, 2178, 2266, 3401, 3422, 4751, 5914, 6097, 11403, 16519, 24227, 24447, 27041, 29591, 41466, 44459, 46522, 49458, 55198, 64177, 71877, 79898, 102411, 110503, 113258 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Robert Price, Table of n, a(n) for n = 1..57 Ray Ballinger, Proth Search Page Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600 Wilfrid Keller, List of primes k.2^n - 1 for k < 300 Eric Weisstein's World of Mathematics, Proth Prime MAPLE select(k->isprime(309*2^k+1), [\$1..1000]); # Muniru A Asiru, Jan 05 2019 MATHEMATICA Select[Range[1000], PrimeQ[309*2^# + 1] &] CROSSREFS Sequence in context: A191469 A091053 A095064 * A056353 A111274 A133385 Adjacent sequences:  A323141 A323142 A323143 * A323145 A323146 A323147 KEYWORD nonn,hard AUTHOR Robert Price, Jan 05 2019 STATUS approved

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Last modified May 26 02:56 EDT 2020. Contains 334613 sequences. (Running on oeis4.)