A103076 - OEIS

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A103076

Numbers n such that 8*10^n + 2*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

2, 20, 33, 62, 68, 86, 195, 524, 530, 657, 1874, 2198 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Also numbers n such that (74*10^n+43)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 822...227.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(74*10^n + 43)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A061471 A112271 A201122 * A062133 A050684 A073214` `Adjacent sequences: A103073 A103074 A103075 * A103077 A103078 A103079`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`

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Last modified February 15 03:59 EST 2012. Contains 205694 sequences.