A103045 - OEIS

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A103045

Numbers n such that 6*10^n + 8*R_n - 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

2, 3, 8, 50, 56, 72, 108, 132, 182, 1100, 1368, 1605, 5132, 22682 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Also numbers n such that (62*10^n-53)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 688...883.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(62*10^n - 53)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A066084 A141319 A001289 * A126464 A041979 A001686` `Adjacent sequences: A103042 A103043 A103044 * A103046 A103047 A103048`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`a(14) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 14 22:54 EST 2012. Contains 205685 sequences.