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 A309527 Numbers k such that 6^k + 17 is prime. 0
 1, 2, 3, 5, 8, 10, 19, 27, 79, 198, 565, 787, 2183, 3811, 4748, 6210, 7887, 8965, 13303 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(20) > 14000. - Daniel Starodubtsev, Apr 17 2020 LINKS EXAMPLE 3 is in the sequence because 6^3 + 17 = 233, which is prime. PROG (PARI) lista(nn)=for(k=0, nn, if(ispseudoprime(6^k+17), print1(k", "))) CROSSREFS Cf. A013600, A013607, A059614, A145106, A182331, A217351, A217352. Sequence in context: A036961 A122633 A004694 * A023176 A063178 A280205 Adjacent sequences:  A309524 A309525 A309526 * A309528 A309529 A309530 KEYWORD nonn,more,hard,less AUTHOR Daniel Starodubtsev, Aug 06 2019 EXTENSIONS a(17)-a(18) from Daniel Starodubtsev, Mar 16 2020 a(19) from Daniel Starodubtsev, Apr 17 2020 STATUS approved

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Last modified November 30 13:34 EST 2021. Contains 349420 sequences. (Running on oeis4.)