A037177 Numbers k such that 2047*2^k+1 is prime.

6, 14, 18, 48, 60, 80, 296, 354, 428, 738, 2118, 2856, 2960, 6992, 25610, 26520, 27354, 36804, 41616, 48684, 52236, 58400

Offset

1,1

Links

Table of n, a(n) for n=1..22.

E. L. Blanton, Jr., S. P. Hurd and J. S. McCranie, On a digraph defined by squaring modulo n, Fibonacci Quart. 30 (Nov. 1992), 322-333.

Prog

(PARI) is(n)=ispseudoprime(2047*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A032500 A053474 A072204 * A351975 A255217 A048747

Adjacent sequences: A037174 A037175 A037176 * A037178 A037179 A037180

Keyword

nonn,hard,more

Author

Jud McCranie

Extensions

The term 738 was omitted from the reference. 4 more terms Jun 15 1998.

a(19)-a(22) from Michael S. Branicky, Jul 12 2023

Status

approved