OFFSET
1,1
EXAMPLE
5 + prime(5) = 5 + 11 = 16 = 2^4.
12335313 + prime(12335313) = 236421376 = 124^4.
PROG
(PARI) isok(n) = ispower(n+prime(n), 4); \\ Michel Marcus, Jan 08 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Giovanni Resta, Feb 13 2006
EXTENSIONS
a(11)-a(23) from Donovan Johnson, Jul 02 2010
STATUS
approved