A103066 - OEIS

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A103066

Numbers n such that 7*10^n + 8*R_n - 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 3, 6, 60, 288, 1314, 1728, 2493, 13893, 13944, 17100 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (71*10^n-53)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 788...883.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(71*10^n - 53)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A012473 A058161 A012877 * A145887 A137123 A137133` `Adjacent sequences: A103063 A103064 A103065 * A103067 A103068 A103069`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`
	EXTENSIONS	`a(9)-a(11) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 15 18:11 EST 2012. Contains 205835 sequences.