A103007 - OEIS

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A103007

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

1, 3, 7, 15, 22, 189, 445, 543, 633, 757, 8725, 9003 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (46*10^n+71)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 511...119.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(46*10^n + 71)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A046932 A015821 A091711 * A077790 A165469 A160160` `Adjacent sequences: A103004 A103005 A103006 * A103008 A103009 A103010`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.