A058221 - OEIS

A058221

Next-to-smallest k such that 2^(2^n) - k is prime.

2, 5, 15, 17, 17, 83, 173, 357, 629, 179, 2543, 8067, 5619, 29027, 38783, 99267

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

PROG

(PARI) a(n) = my(N = 2^(2^n)); N - precprime(precprime(N)-1) \\ Michel Marcus, Jun 29 2013

CROSSREFS

KEYWORD

nonn,hard,more

AUTHOR

EXTENSIONS

a(15) from Jinyuan Wang, Jun 06 2020

a(16) from Michael S. Branicky, Apr 23 2023

STATUS

approved