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 A322971 Numbers k such that 347*2^k+1 is prime. 1
 3, 7, 15, 23, 27, 175, 259, 391, 607, 679, 863, 927, 999, 1339, 1371, 1555, 2103, 2151, 2715, 5619, 6411, 7055, 12927, 19015, 26095, 42523, 45719, 55519, 70971, 87663, 176007, 243391, 287083, 544887, 696327, 902995, 1041223, 1061675, 1218211, 1355595 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Price, Table of n, a(n) for n = 1..42 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(347*2^k+1), [\$1..1000]); # Muniru A Asiru, Jan 02 2019 MATHEMATICA Select[Range[1000], PrimeQ[347*2^# + 1] &] (* Robert Price, Jan 01 2019 *) CROSSREFS Sequence in context: A091711 A103007 A077790 * A165469 A160160 A192122 Adjacent sequences:  A322968 A322969 A322970 * A322972 A322973 A322974 KEYWORD nonn,hard AUTHOR Robert Price, Jan 01 2019 STATUS approved

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Last modified December 10 14:27 EST 2019. Contains 329896 sequences. (Running on oeis4.)