id:A107280 - OEIS Search Results

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Numbers n such that 22446688 * 10^n + 1 is prime.

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11, 36, 53, 54, 109, 123, 259, 380, 877, 1205, 1795, 14153, 21965 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`These are almost-all-even-digits primes, and they have all been certified. No more terms up to 25000. Primality proof for the largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] Primality testing 2244668810^21965+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 2244668810^21965+1 is prime! (70.7023s+0.0215s)`
	LINKS	`R. Ondrejka, The Top Ten: a Catalogue of Primal Configurations.`
	CROSSREFS	`Cf. A068690.` `Sequence in context: A123749 A012644 A138893 this_sequence A044088 A044469 A015246` `Adjacent sequences: A107277 A107278 A107279 this_sequence A107281 A107282 A107283`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), May 19 2005`

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Last modified September 6 00:03 EDT 2008. Contains 143485 sequences.