OFFSET
1,48
COMMENTS
It is conjectured that there are infinitely many primes of the form x^32 + 1 (and thus this sequence never becomes constant), but this has not been proved.
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..304 (n = 1..128 from Henryk Dabrowski)
EXAMPLE
a(55) = 2 because the only primes of the form x^32 + 1 < 10^55 are the primes: 2, 185302018885184100000000000000000000000000000001.
PROG
(PARI) a(n) = sum(k=1, (10^n-1)^(1/32), isprime(k^32+1))
CROSSREFS
KEYWORD
nonn
AUTHOR
Henryk Dabrowski, Jul 30 2012
STATUS
approved