id:A103005 - OEIS Search Results

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Numbers n such that 5*10^n + R_n + 2 is a prime, where R_n = 11...1 is the repunit (A002275) of length n.

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1, 3, 19, 109, 129, 280, 387, 447, 487, 1048, 3298, 3460, 9454 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (46*10^n+17)/9 is a prime.`
	LINKS	`Makoto Kamada, Factorizations of 511...113.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(46*10^n + 17)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A089164 A072950 A130425 this_sequence A162354 A132959 A037154` `Adjacent sequences: A103002 A103003 A103004 this_sequence A103006 A103007 A103008`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.