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A032406
Numbers k such that 113*2^k+1 is prime.
0
1, 5, 13, 33, 145, 365, 409, 509, 553, 673, 733, 961, 1045, 1541, 2473, 3461, 5841, 6221, 9961, 10753, 16589, 26573, 68161, 118705, 129845, 160645, 223413, 281769, 667533, 916801, 1157413, 1960341, 2104825
OFFSET
1,2
MATHEMATICA
Select[Range[1000], PrimeQ[113*2^# + 1] & ] (* Robert Price, Dec 17 2018 *)
PROG
(PARI) is(n)=ispseudoprime(113*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A055426 A146621 A147086 * A146917 A283329 A201170
KEYWORD
nonn,more
EXTENSIONS
Extended by Hugo Pfoertner, Jul 02 2003
a(29)-a(32) from the Ray Ballinger and Wilfrid Keller link by_Robert Price_, Dec 17 2018
a(33) from Jeppe Stig Nielsen, May 30 2020
STATUS
approved