A171411 Numbers k such that 1 + 5*10^k + 100^k is prime.

0, 1, 2, 4, 5, 8, 27, 165, 230, 237, 369, 485, 628, 875, 964, 1419, 4083

Offset

1,3

Comments

No more terms up to k=7600. The value corresponding to 4083 was certified prime with WinPFGW.

Links

Table of n, a(n) for n=1..17.

Chris K. Caldwell, Prime Pages, Database Search Output

Prog

(PARI) is(n)=ispseudoprime(1+5*10^n+100^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A171376, A171459, A171514, A171554.

Sequence in context: A344997 A277289 A218347 * A291607 A092752 A152603

Adjacent sequences: A171408 A171409 A171410 * A171412 A171413 A171414

Keyword

more,nonn

Author

Jason Earls, Dec 08 2009

Status

approved