A103033 - OEIS

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A103033

Numbers n such that 6*10^n + 3*R_n + 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 3, 4, 5, 6, 10, 13, 58, 96, 178, 360, 420, 455, 1008, 1517, 2975, 3999, 5425, 10819, 16036 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (19*10^n+11)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 633...337.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(19*10^n + 11)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A071186 A174057 A164977 * A099561 A110300 A143713` `Adjacent sequences: A103030 A103031 A103032 * A103034 A103035 A103036`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`Addition of a(19)-a(20) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 10 2010`

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Last modified February 15 12:25 EST 2012. Contains 205786 sequences.