1,1

No more terms up to n=7200.

Table of n, a(n) for n=1..7.

(PARI) is(n)=ispseudoprime(10^n*(4+3*10^n)+3) \\ Charles R Greathouse IV, Jun 13 2017

Sequence in context: A180982 A195690 A329965 * A152885 A295182 A052613

Adjacent sequences: A171579 A171580 A171581 * A171583 A171584 A171585

more,nonn

Jason Earls, Dec 12 2009

approved