id:A103064 - 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, 7, 90, 93, 125, 147, 498, 868, 879, 1157, 2958, 3018, 3317, 3822, 6948, 8885, 13092 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also numbers n such that (23*10^n-11)/3 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 766...663.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(23*10^n - 11)/3], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A062747 A099719 A142995 this_sequence A007820 A123694 A085026` `Adjacent sequences: A103061 A103062 A103063 this_sequence A103065 A103066 A103067`
	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 December 2 11:54 EST 2009. Contains 167921 sequences.