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A037177
Numbers k such that 2047*2^k+1 is prime.
0
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
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
KEYWORD
nonn,hard,more
AUTHOR
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