id:A111391 - OEIS Search Results

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Numbers n such that 10^(n+1) +(10^n-1) is a prime.

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1, 9, 11, 17, 22, 29, 36, 37, 52, 166, 448, 2011, 3489, 4871, 6982 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`Do[ If[ PrimeQ[10^(n + 1) + (10^n - 1)], Print[n]], {n, 9500}]`
	CROSSREFS	`Cf. A096209.` `Sequence in context: A048464 A075824 A108113 this_sequence A077788 A137018 A090771` `Adjacent sequences: A111388 A111389 A111390 this_sequence A111392 A111393 A111394`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 15 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.