A103037 - OEIS

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A103037

Numbers n such that 6*10^n + 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

3, 105, 627, 687, 699, 5715, 11391, 11673 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Also numbers n such that (58*10^n+41)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 644...449.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(58*10^n + 41)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A101780 A197632 A050651 * A075528 A101485 A074072` `Adjacent sequences: A103034 A103035 A103036 * A103038 A103039 A103040`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005`
	EXTENSIONS	`a(7)-a(8) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 16 13:12 EST 2012. Contains 205909 sequences.