id:A102933 - OEIS Search Results

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

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

	OFFSET	`1,2`
	COMMENT	`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 this_sequence A122019 A033627 A066512` `Adjacent sequences: A102930 A102931 A102932 this_sequence A102934 A102935 A102936`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.