A102966 - OEIS

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A102966

Numbers n such that 3*10^n + 2*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

0, 1, 3, 6, 12, 408, 649, 949, 963, 1005, 2700, 19779, 22518, 22611 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	COMMENTS	`Also numbers n such that (29*10^n-11)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 322...221.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(29*10^n-11)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A139416 A013563 A009788 * A189420 A145604 A053569` `Adjacent sequences: A102963 A102964 A102965 * A102967 A102968 A102969`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`
	EXTENSIONS	`Addition of a(12)-a(14) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 13 2010`

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Last modified February 15 13:31 EST 2012. Contains 205802 sequences.