OFFSET
2,1
COMMENTS
EXAMPLE
a(7)=15 because m=15 is the least m > 1 such that 2^7 - m is prime.
PROG
(PARI) a(n)=2^n-precprime(2^n-2)
CROSSREFS
KEYWORD
nonn
AUTHOR
Alexei Kourbatov, Feb 08 2016
STATUS
approved