OFFSET
1,1
COMMENTS
a(5) found by Serge Batalov, Jun 11 2012.
LINKS
Henri Lifchitz, Renaud Lifchitz, Probable Primes Top 10000.
EXAMPLE
2^99+255 is the smallest 100-bit prime, 2^999+1239 is the smallest 1000-bit prime, etc.
PROG
(PARI) a(n)=nextprime(2^(10^n-1))-2^(10^n-1)
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Charles R Greathouse IV, Jun 16 2012
STATUS
approved