id:A103018 - OEIS Search Results

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Numbers n such that 5*10^n + 6*R_n + 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

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1, 2, 3, 10, 25, 29, 34, 73, 76, 77, 651, 884, 938, 1252, 1893, 3342, 4034, 6168, 6216, 6231, 6812, 11046, 15448, 16628, 16918, 18734 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (17*10^n+7)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 566...669.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(17*10^n + 7)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A105286 A059929 A123029 this_sequence A005158 A005225 A052929` `Adjacent sequences: A103015 A103016 A103017 this_sequence A103019 A103020 A103021`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 01 2008`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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