id:A056701 - OEIS Search Results

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

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0, 1, 2, 3, 4, 10, 16, 22, 53, 91, 94, 106, 138, 210, 282, 522, 597, 1049, 2227, 6459, 10582 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Also numbers n such that (7*10^n-1)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 233...33` `Index entries for primes involving repunits`
	MATHEMATICA	`Do[ If[ PrimeQ[ 210^n + 3(10^n-1)/9], Print[n]], {n, 0, 15001}]`
	CROSSREFS	`Sequence in context: A095384 A115899 A085934 this_sequence A055506 A098088 A080500` `Adjacent sequences: A056698 A056699 A056700 this_sequence A056702 A056703 A056704`
	KEYWORD	`hard,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 10 2000`

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Last modified December 6 13:45 EST 2009. Contains 170429 sequences.