A103005 - OEIS

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A103005

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.

1, 3, 19, 109, 129, 280, 387, 447, 487, 1048, 3298, 3460, 9454, 26103 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`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 * A162354 A132959 A037154` `Adjacent sequences: A103002 A103003 A103004 * A103006 A103007 A103008`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`Addition of a(14) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 12 2010`

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.