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A364078
Numbers k such that (18^k - 1)^2 - 2 is prime.
3
2, 8, 30, 98, 110, 185, 912, 2514, 4074, 10208, 15123, 19395, 69354
OFFSET
1,1
COMMENTS
Such primes are sometimes called Carol primes of base 18.
LINKS
Prime-Wiki, Carol-Kynea prime.
Eric Weisstein's World of Mathematics, Near-Square Prime.
PROG
(PARI) for(k=1, 1200, ispseudoprime((18^k-1)^2-2)&&print1(k, ", "))
CROSSREFS
Cf. A091515 (b=2), A100901 (b=6), A100903 (b=10), A364076 (b=12), A100905 (b=14), A364080 (b=20), A100907 (b=22).
Cf. A364079.
Sequence in context: A131318 A010749 A299415 * A373904 A230701 A365693
KEYWORD
nonn,hard,more
AUTHOR
Jeppe Stig Nielsen, Jul 03 2023
STATUS
approved