A171554 Numbers k such that 1 + 9*10^k + 100^k is prime.

0, 1, 5, 71, 311

Offset: 1

Author

Jason Earls, Dec 11 2009

Keywords

• more
• nonn

Comments

No more terms up to k = 7200.

No more terms up to k = 27200. - Michael S. Branicky, Jun 30 2024

Crossrefs

Cf. A171376, A171411, A171459, A171514.

Programs

Mathematica

Select[Range[0,320],PrimeQ[1+9 10^#+100^#]&] (* Harvey P. Dale, Nov 23 2023 *)

PARI

is(n)=ispseudoprime(1+9*10^n+100^n) \\ Charles R Greathouse IV, Jun 13 2017