login
A032407
Numbers k such that 115*2^k+1 is prime.
0
2, 12, 20, 26, 42, 114, 228, 396, 456, 482, 1298, 3048, 4968, 7568, 28004, 32466, 40548, 66576, 78588, 101016, 120650, 157488, 292730, 778112, 1338620
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[115*2^# + 1] & ] (* Robert Price, Dec 17 2018 *)
PROG
(PARI) is(n)=ispseudoprime(115*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A305162 A339709 A137311 * A136725 A023534 A286683
KEYWORD
nonn,more
EXTENSIONS
Extended by Hugo Pfoertner, Jul 02 2003
a(22)-a(25) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 17 2018
STATUS
approved