login
A301644
Primes of form 3*k^k + 1.
4
13, 769, 139969, 30000000001
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
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 * A182932 A221934 A328033
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Mar 25 2018
STATUS
approved