A171582 Numbers k such that 10^k*(4+3*10^k)+3 is prime.

2, 6, 72, 246, 273, 292, 915, 14460, 17830

Offset

1,1

Comments

No more terms up to k = 7200.

Links

Table of n, a(n) for n=1..9.

Prog

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

Crossrefs

Cf. A171583.

Sequence in context: A195690 A359365 A329965 * A152885 A295182 A052613

Adjacent sequences: A171579 A171580 A171581 * A171583 A171584 A171585

Keyword

more,nonn

Author

Jason Earls, Dec 12 2009

Extensions

a(8) from Michael S. Branicky, Jun 24 2023

a(9) from Michael S. Branicky, Oct 31 2024

Status

approved