A103044 - OEIS

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A103044

Numbers n such that 6*10^n + 8*R_n - 7 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 4, 10, 13, 178, 304, 331, 502, 744, 1027, 1770, 5305 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (62*10^n-71)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 688...881.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(62*10^n - 71)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A032821 A101576 A179134 * A114719 A116954 A102686` `Adjacent sequences: A103041 A103042 A103043 * A103045 A103046 A103047`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.