A103106 - OEIS

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A103106

Numbers n such that 9*10^n + 7*R_n - 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

6, 15, 36, 45, 447, 1031, 1239, 3492, 6069, 13647, 17238 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Also numbers n such that (88*10^n-43)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 977...773.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(88*10^n - 43)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A100513 A191002 A127469 * A074132 A074149 A177206` `Adjacent sequences: A103103 A103104 A103105 * A103107 A103108 A103109`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`
	EXTENSIONS	`a(10)-a(11) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 17 06:27 EST 2012. Contains 205998 sequences.