id:A103000 - OEIS Search Results

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Numbers n such that 4*10^n + 8*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

+0
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3, 4, 6, 10, 12, 18, 40, 48, 96, 106, 114, 144, 364, 618, 1090 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Also numbers n such that (44*10^n+1)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 488...889.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(44*10^n + 1)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Adjacent sequences: A102997 A102998 A102999 this_sequence A103001 A103002 A103003` `Sequence in context: A031132 A057477 A113887 this_sequence A074321 A085378 A125869`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2005`

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Last modified October 16 00:31 EDT 2008. Contains 145098 sequences.