id:A071215 - OEIS Search Results

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Number of distinct prime factors of sum of 2 successive prime.

+0
4

1, 1, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 3, 3, 2, 2, 3, 1, 3, 2, 2, 2, 2, 3, 3, 3, 4, 2, 3, 3, 3, 2, 3, 2, 3, 3, 2, 4, 3, 2, 3, 3, 2, 4, 3, 3, 3, 3, 3, 4, 2, 3, 3, 2, 3, 3, 3, 2, 3, 3, 2, 3, 3, 3, 4, 2, 2, 3, 3, 3, 2, 3, 3, 2, 3, 2, 3, 4, 3, 3, 4, 3, 2, 2, 3, 2, 3, 3, 4, 4, 3, 4, 3, 4, 3, 3, 3, 3, 3, 2, 3, 3, 2, 4, 3 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n)=A001221[A001043(n)]`
	MATHEMATICA	`lf[x_] := Length[FactorInteger[x]] Table[lf[Prime[w+1]+Prime[w]], {w, 1, 128}]`
	PROGRAM	`(PARI) A071215(n)=omega(prime(n)+prime(n+1)) - M. F. Hasler (maximilian.hasler(AT)gmail.com), Jul 23 2007`
	CROSSREFS	`Cf. A001221, A001043, A071216.` `Adjacent sequences: A071212 A071213 A071214 this_sequence A071216 A071217 A071218` `Sequence in context: A024676 A093429 A089842 this_sequence A076221 A029235 A106696`
	KEYWORD	`easy,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), May 17 2002`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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