A102967 - OEIS

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A102967

Numbers n such that 3*10^n + 2*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 42, 5022 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (29*10^n+43)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 322...227.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(29*10^n+43)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A181193 A053875 A048538 * A091545 A101630 A005791` `Adjacent sequences: A102964 A102965 A102966 * A102968 A102969 A102970`
	KEYWORD	`bref,more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`

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Last modified February 14 08:58 EST 2012. Contains 205614 sequences.