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 A323105 Numbers k such that 411*2^k+1 is prime. 0
 1, 4, 7, 19, 37, 55, 72, 79, 81, 136, 139, 955, 976, 979, 1537, 1579, 2292, 3277, 4644, 6007, 6391, 6805, 17959, 25999, 58327, 60919, 112957, 117781, 130204, 181176, 192637, 459595, 793944, 1078339, 1677196, 1861627, 2115559 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS 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(411*2^k+1), [\$1..1000]); # Muniru A Asiru, Jan 04 2019 MATHEMATICA Select[Range[1000], PrimeQ[411*2^# + 1] &] CROSSREFS Sequence in context: A291596 A323655 A062306 * A006130 A140167 A182228 Adjacent sequences: A323102 A323103 A323104 * A323106 A323107 A323108 KEYWORD nonn,more,hard AUTHOR Robert Price, Jan 04 2019 EXTENSIONS a(37) from Jeppe Stig Nielsen, May 30 2020 STATUS approved

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Last modified February 5 02:12 EST 2023. Contains 360082 sequences. (Running on oeis4.)