OFFSET
1,1
EXAMPLE
13 = 2^4 - 3; 4093 = 8^4 - 3.
MAPLE
# choose N large, then S is the desired set
f:=n->n^4 - 3:
S:={}:
for n from 0 to N do if(isprime(f(n))) then S:=S union {f(n)}: fi: od:
CROSSREFS
KEYWORD
nonn
AUTHOR
Patrick Devlin, Apr 25 2012
STATUS
approved