A103012 - OEIS

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A103012

Numbers n such that 5*10^n + 3*R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 47, 69, 99, 575, 715, 2179, 10541 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (16*10^n+17)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 533...339.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(16*10^n + 17)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A106874 A023331 A187923 * A166958 A112056 A033231` `Adjacent sequences: A103009 A103010 A103011 * A103013 A103014 A103015`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`a(8) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 17 09:41 EST 2012. Contains 206009 sequences.