A103094 - OEIS

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A103094

Numbers n such that 9*10^n + 2*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

5, 29, 60, 147, 186, 456, 678, 1373, 3378, 15726 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Also numbers n such that (83*10^n+7)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 922...223.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(83*10^n + 7)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A177831 A115706 A031394 * A108928 A097812 A176333` `Adjacent sequences: A103091 A103092 A103093 * A103095 A103096 A103097`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`
	EXTENSIONS	`a(10) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 16 21:30 EST 2012. Contains 205971 sequences.