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A302123 Numbers k such that 6*k^k - 5 is prime. 6
2, 3, 4, 7, 8, 9, 33, 138, 251, 467, 489 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

MATHEMATICA

Select[Range[1, 1000], PrimeQ[6*#^# - 5] &] (* Vaclav Kotesovec, Apr 02 2018 *)

PROG

(PARI) for(n=0, 300, if(isprime(6*n^n-5), print1(n", ")))

CROSSREFS

Numbers k such that b*k^k - b + 1 is prime: A301521 (b=4), this sequence (b=6).

Cf. A302090, A302124.

Sequence in context: A111116 A113318 A056033 * A286337 A047547 A014456

Adjacent sequences:  A302120 A302121 A302122 * A302124 A302125 A302126

KEYWORD

nonn,more,hard

AUTHOR

Seiichi Manyama, Apr 01 2018

EXTENSIONS

a(10)-a(11) from Vaclav Kotesovec, Apr 02 2018

STATUS

approved

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Last modified October 20 22:44 EDT 2019. Contains 328291 sequences. (Running on oeis4.)