A109397 Numbers k such that 22 * 10^k + 1 is prime.

0, 6, 10, 11, 102, 146, 296, 1415, 2324, 4374, 12590

Offset

1,2

Comments

All terms have been certified. Primality proof for the largest: PFGW Version 1.2.0 for Windows [FFT v23.8] Primality testing 22*10^12590+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Calling Brillhart-Lehmer-Selfridge with factored part 69.89% 22*10^12590+1 is prime! (47.5292s+0.3107s)

No more terms up to 31000.

Links

Table of n, a(n) for n=1..11.

Prog

(PARI) is(n)=ispseudoprime(22*10^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A056807.

Sequence in context: A096549 A248757 A136812 * A133210 A324975 A141467

Adjacent sequences: A109394 A109395 A109396 * A109398 A109399 A109400

Keyword

more,nonn

Author

Jason Earls, Aug 26 2005

Extensions

0 added by Arkadiusz Wesolowski, Oct 27 2011

Status

approved