A102939 - OEIS

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A102939

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

1, 2, 3, 18, 177, 324, 388, 392, 404, 531, 1083, 12546, 22443 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (5*10^n-11)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 166...663.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(5*10^n - 11)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A184719 A076016 A107095 * A073983 A139319 A092925` `Adjacent sequences: A102936 A102937 A102938 * A102940 A102941 A102942`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004`
	EXTENSIONS	`Addition of a(12)-a(13) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 12 2010`

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Last modified February 17 06:25 EST 2012. Contains 205996 sequences.