OFFSET
1,2
COMMENTS
An example of Sun's conjecture in A217788: For a(n)>5, also bases b such [2;3;5] seen as a number written in base b, is prime.
LINKS
Paolo P. Lava, Table of n, a(n) for n = 1..1000
PROG
(PARI) n=#v=[2, 3, 5]; for(b=0, 500, ispseudoprime(sum(k=1, n, b^(n-k)*v[k]))&print1(b", "))
(Magma) [b: b in [0..500] | IsPrime(2*b^2+3*b+5)]; // Bruno Berselli, Apr 11 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, Mar 31 2013
STATUS
approved