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A032404
Numbers k such that 109*2^k+1 is prime.
0
6, 14, 58, 62, 318, 1574, 2034, 26082, 96838, 103146, 235106, 1011102, 1704658, 2280194
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(109*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A200187 A107301 A118432 * A059954 A252541 A333103
KEYWORD
nonn,hard,more
EXTENSIONS
a(11)-a(13) from http://www.prothsearch.com/riesel1.html by Robert Price, Dec 14 2018
a(14) from Jeppe Stig Nielsen, Apr 04 2020
STATUS
approved