A103017 - OEIS

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A103017

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

1, 2, 4, 7, 22, 28, 36, 109, 155, 868, 1777, 2465, 3874, 4506, 4684, 5503, 13975, 15632 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (17*10^n-11)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 566...663.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(17*10^n - 11)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A188497 A153550 A102984 * A091833 A171978 A026080` `Adjacent sequences: A103014 A103015 A103016 * A103018 A103019 A103020`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`a(17)-a(18) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 15 02:50 EST 2012. Contains 205694 sequences.