id:A102963 - OEIS Search Results

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

+0
2

0, 1, 7, 8, 11, 14, 19, 32, 41, 53, 61, 133, 157, 239, 1237 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Also numbers n such that (26*10^n+1)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 288...889.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(26*10^n + 1)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A054221 A090385 A145826 this_sequence A117619 A098731 A105740` `Adjacent sequences: A102960 A102961 A102962 this_sequence A102964 A102965 A102966`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.