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 A323194 Numbers k such that 449*2^k+1 is prime. 0
 3, 5, 17, 25, 53, 65, 75, 93, 227, 263, 265, 455, 627, 805, 1187, 1253, 3345, 6377, 11465, 11977, 12317, 25097, 34683, 42097, 113387, 139585, 186287, 214323, 1093035 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..29. 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^n-1 (or k*2^n+1) is prime MATHEMATICA Select[Range[1000], PrimeQ[449*2^# + 1] &] CROSSREFS Sequence in context: A354724 A255401 A263811 * A024867 A025111 A253204 Adjacent sequences: A323191 A323192 A323193 * A323195 A323196 A323197 KEYWORD nonn,more,hard AUTHOR Robert Price, Jan 06 2019 STATUS approved

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Last modified May 31 19:41 EDT 2023. Contains 363068 sequences. (Running on oeis4.)