A102936 - OEIS

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A102936

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

1, 3, 6, 15, 70, 76, 13024 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (14*10^n-23)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 155...553.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(14*10^n - 23)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A051169 A051610 A102356 * A009192 A013273 A013277` `Adjacent sequences: A102933 A102934 A102935 * A102937 A102938 A102939`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004`
	EXTENSIONS	`Addition of a(7) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 13 2010`

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Last modified February 17 23:55 EST 2012. Contains 206085 sequences.