A103077 - OEIS

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A103077

Numbers n such that 8*10^n + 2*R_n + 7 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 2, 5, 8, 14, 55, 103, 331, 1067, 13711, 24397 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (74*10^n+61)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 822...229.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(74*10^n + 61)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A023674 A139218 A017988 * A090980 A183409 A024808` `Adjacent sequences: A103074 A103075 A103076 * A103078 A103079 A103080`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`
	EXTENSIONS	`a(10)-a(11) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 16 05:39 EST 2012. Contains 205860 sequences.