id:A103065 - OEIS Search Results

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Numbers n such that 7*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, 6, 8, 18, 19, 21, 32, 48, 65, 72, 99, 120, 201, 308, 717, 968, 1344, 2132, 3567, 3968, 8327, 10598, 12465, 15875, 18895 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (23*10^n+7)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 766...669.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(23*10^n + 7)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A029867 A056348 A057574 this_sequence A005508 A110448 A064450` `Adjacent sequences: A103062 A103063 A103064 this_sequence A103066 A103067 A103068`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`
	EXTENSIONS	`More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 01 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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