id:A103091 - OEIS Search Results

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Numbers n such that 8*10^n + 7*R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

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1, 3, 6, 31, 36, 61, 117, 229, 339, 3165, 3958, 5277, 5343, 6079, 6535, 8485 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (79*10^n+11)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 877...779.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(79*10^n + 11)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A002164 A117805 A154135 this_sequence A101751 A133665 A124178` `Adjacent sequences: A103088 A103089 A103090 this_sequence A103092 A103093 A103094`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`

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Last modified November 24 19:42 EST 2009. Contains 167435 sequences.