id:A103035 - OEIS Search Results

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Numbers n such that 6*10^n + 4*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

+0
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2, 5, 6, 11, 15, 69, 90, 134, 189, 245, 267, 270, 470, 1575, 2295, 2507, 3512, 3825, 6857 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Also numbers n such that (58*10^n-13)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 644...443.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(58*10^n - 13)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A024520 A015613 A135013 this_sequence A088273 A049054 A135476` `Adjacent sequences: A103032 A103033 A103034 this_sequence A103036 A103037 A103038`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.