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A171514 Numbers n such that 1 + 8*10^n + 100^n is prime. 0
1, 3, 6, 9, 13, 17, 29, 63, 90, 531 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

No more terms up to n=7500.

LINKS

Table of n, a(n) for n=1..10.

MATHEMATICA

Select[Range[1000], PrimeQ[1 + 8 10^# + 100^# ] &] (* Vincenzo Librandi, Apr 26 2014 *)

PROG

(PARI) is(n)=ispseudoprime(1+8*10^n+100^n) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A004137 A080060 A004131 * A032782 A310157 A310158

Adjacent sequences:  A171511 A171512 A171513 * A171515 A171516 A171517

KEYWORD

more,nonn

AUTHOR

Jason Earls, Dec 10 2009

STATUS

approved

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Last modified October 23 14:42 EDT 2021. Contains 348214 sequences. (Running on oeis4.)