A102959 - OEIS

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A102959

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

1, 4, 34, 36, 42, 52, 163, 208, 216, 1417, 14646, 22794, 25648 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (25*10^n+11)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 277...779.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(25*10^n + 11)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A113086 A058153 A020197 * A057959 A053902 A054464` `Adjacent sequences: A102956 A102957 A102958 * A102960 A102961 A102962`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`
	EXTENSIONS	`a(11)-a(13) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 16 13:12 EST 2012. Contains 205909 sequences.