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A364079
Numbers k such that (18^k + 1)^2 - 2 is prime.
3
1, 10, 21, 25, 31, 1083, 40485, 82516
OFFSET
1,2
COMMENTS
Such primes are sometimes called Kynea 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. A091513 (b=2), A100902 (b=6), A100904 (b=10), A364077 (b=12), A100906 (b=14), A364081 (b=20), A100908 (b=22).
Cf. A364078.
Sequence in context: A338908 A226195 A181450 * A367576 A353402 A353432
KEYWORD
nonn,hard,more
AUTHOR
Jeppe Stig Nielsen, Jul 03 2023
STATUS
approved