id:A102951 - OEIS Search Results

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Numbers n such that 2*10^n + 3*R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

+0
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1, 2, 3, 4, 8, 11, 13, 24, 28, 52, 54, 94, 297, 657, 1006, 5347, 8189, 9314 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (7*10^n+17)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 233...339.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(7*10^n + 17)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A114854 A127279 A050727 this_sequence A135909 A046812 A164573` `Adjacent sequences: A102948 A102949 A102950 this_sequence A102952 A102953 A102954`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`

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Last modified February 9 11:24 EST 2010. Contains 172296 sequences.