A103104 - OEIS

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A103104

Numbers n such that 9*10^n + 6*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 2, 4, 7, 13, 28, 58, 86, 92, 108, 1408, 1486, 1712, 2674, 3880, 5536, 7588, 7650, 10558, 15532, 17959 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (29*10^n+1)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 966...667.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(29*10^n + 1)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A025246 A112740 A136408 * A103480 A024826 A102114` `Adjacent sequences: A103101 A103102 A103103 * A103105 A103106 A103107`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`
	EXTENSIONS	`a(19)-a(21) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 14 11:11 EST 2012. Contains 205616 sequences.