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A301644 Primes of form 3*k^k + 1. 4
13, 769, 139969, 30000000001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The next term is too large to include.

The next term (a(5)) has 703 digits. - Harvey P. Dale, Sep 04 2018

LINKS

Table of n, a(n) for n=1..4.

FORMULA

a(n) = 3*(2*A160600(n))^(2*A160600(n)) + 1.

MATHEMATICA

Select[Table[3*k^k+1, {k, 500}], PrimeQ] (* Harvey P. Dale, Sep 04 2018 *)

CROSSREFS

Primes of form b*k^k + 1: A121270 (b=1), A216148 (b=2), this sequence (b=3), A301641 (b=4), A301642 (b=16).

Cf. A160600.

Sequence in context: A086157 A033509 A262099 * A060825 A182932 A221934

Adjacent sequences:  A301641 A301642 A301643 * A301645 A301646 A301647

KEYWORD

nonn

AUTHOR

Seiichi Manyama, Mar 25 2018

STATUS

approved

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Last modified November 21 09:14 EST 2019. Contains 329362 sequences. (Running on oeis4.)