OFFSET
1,1
COMMENTS
a(n) = n+1 iff n is in A174157.
LINKS
Jens Kruse Andersen, Table of n, a(n) for n = 1..10000
EXAMPLE
8^64 + 11^64 = 4457915690803004131256192897205630962697827851093882159977969339137 is prime. Since 8^64 + 10^64 and 8^64 + 9^64 are both composite, a(8) = 11.
PROG
(Python)
import sympy
from sympy import isprime
def a(n):
..for k in range(n+1, 10**4):
....if isprime(k**64+n**64):
......return k
n = 1
while n < 100:
..print(a(n), end=', ')
..n += 1
(PARI) a(n)=for(k=n+1, 10^4, if(isprime(k^64+n^64), return(k)))
n=1; while(n<100, print1(a(n), ", "); n++)
CROSSREFS
KEYWORD
nonn
AUTHOR
Derek Orr, Jul 08 2014
STATUS
approved