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A032422
Numbers k such that 145*2^k+1 is prime.
0
6, 16, 28, 70, 76, 250, 276, 312, 562, 636, 1366, 1552, 1968, 7000, 7312, 7548, 7852, 8116, 16306, 18868, 20518, 23676, 27400, 75858, 207880, 1233286, 2621020
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[145*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)
PROG
(PARI) is(n)=ispseudoprime(145*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A201020 A088818 A346620 * A164052 A264938 A350011
KEYWORD
nonn,more
EXTENSIONS
a(25)-a(26) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 2018
a(27) from Jeppe Stig Nielsen, Mar 12 2020
STATUS
approved