A102950 - OEIS

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A102950

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

1, 223, 318, 427, 3727, 5227, 8779, 11383, 15415, 26382 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (19*10^n+71)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 211...119.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(19*10^n + 71)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A098591 A152824 A142386 * A143801 A118818 A142437` `Adjacent sequences: A102947 A102948 A102949 * A102951 A102952 A102953`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`
	EXTENSIONS	`Addition of a(8)-a(10) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 13 2010`

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Last modified February 17 18:41 EST 2012. Contains 206074 sequences.