login
A242198
Numbers k such that k*15^k + 1 is prime.
3
8, 14, 44, 154, 274, 694, 17426, 59430
OFFSET
1,1
MATHEMATICA
Select[Range[2000], PrimeQ[# 15^# + 1] &]
PROG
(Magma) [n: n in [0..2500] | IsPrime(n*15^n+1)];
(PARI) is(n)=ispseudoprime(n*15^n+1) \\ Charles R Greathouse IV, Jun 06 2017
CROSSREFS
Cf. similar sequences listed in A242176.
Sequence in context: A301961 A250478 A059676 * A111050 A009453 A332658
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, May 08 2014
EXTENSIONS
a(7)-a(8) from Loeh's list (see Links)
STATUS
approved