id:A103010 - OEIS Search Results

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Numbers n such that 5*10^n + 2*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

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3, 5, 33, 48, 59, 60, 74, 126, 177, 228, 638, 1304, 1644, 2435, 4374, 8750 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Also numbers n such that (47*10^n+43)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 522...227.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(46*10^n + 43)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A047105 A136361 A109173 this_sequence A068111 A162444 A052468` `Adjacent sequences: A103007 A103008 A103009 this_sequence A103011 A103012 A103013`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`

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Last modified November 21 21:21 EST 2009. Contains 167310 sequences.