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 A300408 Primes of the form 19*2^n + 1. 3
 1217, 19457, 1337006139375617 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Next term a(4) = 19*2^366 + 1 > 10^111. For the corresponding exponents n see A032359. LINKS Table of n, a(n) for n=1..3. Ray Ballinger, Wilfried Keller, List of primes k*2^n + 1 for k < 300. MAPLE a:=(n, k)->`if`(isprime(k*2^n+1), k*2^n+1, NULL): seq(a(n, 19), n=1..366); PROG (GAP) Filtered(List([1..500], n->19*2^n + 1), IsPrime); # Muniru A Asiru, Mar 06 2018 (PARI) lista(nn) = {for(k=1, nn, if(ispseudoprime(p=19*2^k+1), print1(p, ", "))); } \\ Altug Alkan, Mar 29 2018 CROSSREFS Cf. A019434, A032359, A039687, A050527, A050528, A050529, A195745, A050526, A300406, A300407. Sequence in context: A059669 A032628 A175964 * A252600 A293479 A031781 Adjacent sequences: A300405 A300406 A300407 * A300409 A300410 A300411 KEYWORD nonn,less AUTHOR Martin Renner, Mar 05 2018 STATUS approved

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Last modified July 18 16:59 EDT 2024. Contains 374388 sequences. (Running on oeis4.)