A102969 - OEIS

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A102969

Numbers n such that 3*10^n + 4*R_n + 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 2, 758, 1334, 2177, 4439, 5198, 6683, 35990 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (31*10^n+23)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 344...447.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(31*10^n+23)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A109949 A151591 A145124 * A179960 A167448 A078169` `Adjacent sequences: A102966 A102967 A102968 * A102970 A102971 A102972`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`
	EXTENSIONS	`Addition of a(9) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 13 2010`

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.