id:A102973 - OEIS Search Results

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Numbers n such that 3*10^n + 5*R_n + 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

+0
2

0, 2, 3, 5, 8, 14, 77, 195, 218, 957, 1052, 1163, 1485, 1731, 1970, 3237 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (32*10^n+31)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 355...559.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(32*10^n+31)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A065955 A104880 A152478 this_sequence A066372 A058519 A151518` `Adjacent sequences: A102970 A102971 A102972 this_sequence A102974 A102975 A102976`
	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.