id:A103078 - OEIS Search Results

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Numbers n such that 8*10^n + 3*R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

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1, 2, 4, 9, 10, 15, 44, 55, 56, 124, 140, 279, 674, 848, 1420, 1462, 3314, 3442, 4141 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (25*10^n+17)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 833...339.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(25*10^n + 17)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A047465 A002258 A026602 this_sequence A060756 A075347 A005733` `Adjacent sequences: A103075 A103076 A103077 this_sequence A103079 A103080 A103081`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.