A103102 - OEIS

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A103102

Numbers n such that 9*10^n + 5*R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 7, 67, 127, 2107, 10003, 13741 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (86*10^n+13)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 955...557.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(86*10^n + 13)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A106111 A142786 A139783 * A139910 A077789 A186655` `Adjacent sequences: A103099 A103100 A103101 * A103103 A103104 A103105`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005`
	EXTENSIONS	`a(6)-a(7) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010`

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Last modified February 16 01:31 EST 2012. Contains 205860 sequences.