A102949 - OEIS

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A102949

Numbers n such that 2*10^n + R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

36, 183, 330, 393, 17520, 27222 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Also numbers n such that (19*10^n+53)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 211...117.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(19*10^n + 53)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A166708 A127657 A054979 * A017138 A120465 A144523` `Adjacent sequences: A102946 A102947 A102948 * A102950 A102951 A102952`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`
	EXTENSIONS	`Addition of a(5)-a(6) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 13 2010`

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Last modified February 17 04:46 EST 2012. Contains 205985 sequences.