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

0, 1, 5, 71, 311

Offset

1,3

Comments

No more terms up to n=7200.

Links

Table of n, a(n) for n=1..5.

Mathematica

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

Prog

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

Crossrefs

Sequence in context: A265030 A295332 A123077 * A197405 A295536 A197427

Adjacent sequences: A171551 A171552 A171553 * A171555 A171556 A171557

Keyword

more,nonn

Author

Jason Earls, Dec 11 2009

Status

approved