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A301524 Numbers k such that 16*k^k - 1 is prime. 1
3, 5, 15, 27 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are odd since 16*(2*m)^(2*m) - 1 = (2^(m+2)*m^m - 1)*(2^(m+2)*m^m + 1). - Altug Alkan, Mar 23 2018

Next term, if it exists, is greater than 5000. - Vaclav Kotesovec, Mar 25 2018

LINKS

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

MATHEMATICA

Select[Range[1000], PrimeQ[16*#^# - 1] &] (* Vaclav Kotesovec, Mar 25 2018 *)

PROG

(PARI) for(n=0, 1000, if(isprime(16*n^n-1), print1(n", ")))

CROSSREFS

Cf. A110931, A301522.

Sequence in context: A056487 A146582 A321985 * A202212 A253790 A053351

Adjacent sequences:  A301521 A301522 A301523 * A301525 A301526 A301527

KEYWORD

nonn,more

AUTHOR

Seiichi Manyama, Mar 23 2018

STATUS

approved

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Last modified December 14 15:07 EST 2019. Contains 329979 sequences. (Running on oeis4.)