A139056 - OEIS

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A139056

a(n) = numbers k for which (k!!-3)/3 is prime.

4, 6, 12, 16, 29, 34, 43 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Primes of the form (-3 + n!!)/3 see A139057`
	MATHEMATICA	`a = {}; Do[If[PrimeQ[(-3 + n!!)/3], AppendTo[a, n]], {n, 1, 1000}]; a`
	CROSSREFS	`Cf. A089085, A007749, A117141.` `Sequence in context: A153355 A024904 A172445 * A152519 A022802 A074997` `Adjacent sequences: A139053 A139054 A139055 * A139057 A139058 A139059`
	KEYWORD	`nonn`
	AUTHOR	`Artur Jasinski (grafix(AT)csl.pl), Apr 07 2008`

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Last modified February 14 21:50 EST 2012. Contains 205663 sequences.