A099411 - OEIS

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A099411

Numbers n such that 3*R_n + 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 2, 3, 6, 46, 394, 978, 2586, 2811, 2968, 3642, 4827, 4918, 5592, 5706 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (10^n+11)/3 is prime.`
	LINKS	`Table of n, a(n) for n=1..15.` `Index entries for primes involving repunits`
	MATHEMATICA	`Do[ If[ PrimeQ[ 3(10^n - 1)/9 + 4], Print[n]], {n, 10000}]`
	CROSSREFS	`Sequence in context: A127315 A018359 A049383 * A018372 A097350 A062309` `Adjacent sequences: A099408 A099409 A099410 * A099412 A099413 A099414`
	KEYWORD	`hard,nonn`
	AUTHOR	`Robert G. Wilson v, Oct 14 2004`
	STATUS	`approved`

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Last modified June 20 04:02 EDT 2013. Contains 226418 sequences.