A103046 - OEIS

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A103046

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

1, 33, 72, 177, 192, 325, 417, 732, 1362, 13947, 14887 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (62*10^n-17)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 688...887.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(62*10^n - 17)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A044135 A044516 A015722 * A063868 A184417 A049012` `Adjacent sequences: A103043 A103044 A103045 * A103047 A103048 A103049`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`a(10)-a(11) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 17 16:00 EST 2012. Contains 206050 sequences.