A109397 - OEIS

A109397

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

0, 6, 10, 11, 102, 146, 296, 1415, 2324, 4374, 12590 (list; graph; refs; listen; history; text; internal format)

	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 2210^12590+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Calling Brillhart-Lehmer-Selfridge with factored part 69.89% 2210^12590+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,changed`
	AUTHOR	`Jason Earls, Aug 26 2005`
	EXTENSIONS	`0 added by Arkadiusz Wesolowski, Oct 27 2011`
	STATUS	`approved`

Last modified February 5 03:15 EST 2023. Contains 360082 sequences. (Running on oeis4.)