A102933 - OEIS

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A102933

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

1, 2, 4, 7, 10, 13, 14, 22, 23, 29, 38, 50, 53, 67, 104, 350, 376, 412, 1205, 1835, 2510, 2668, 6097, 8296, 14296 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (4*10^n+17)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 133...339.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(4*10^n + 17)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A007303 A102988 A080137 * A122019 A190279 A186325` `Adjacent sequences: A102930 A102931 A102932 * A102934 A102935 A102936`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004`
	EXTENSIONS	`Addition of a(25) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 08 2010`

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Last modified February 15 20:03 EST 2012. Contains 205852 sequences.