A065516 - OEIS

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A065516

Differences between products of 2 primes.

2, 3, 1, 4, 1, 6, 1, 3, 1, 7, 1, 1, 3, 1, 7, 3, 2, 4, 2, 1, 4, 3, 4, 5, 3, 5, 3, 1, 1, 4, 2, 1, 1, 11, 5, 4, 3, 1, 2, 1, 1, 6, 4, 1, 7, 1, 1, 2, 1, 9, 3, 1, 2, 5, 3, 8, 1, 5, 2, 2, 7, 7, 1, 1, 2, 1, 3, 4, 1, 1, 2, 1, 1, 2, 5, 9, 2, 10, 2, 4, 1, 5, 3, 3, 2, 7, 4, 9, 2, 2, 4, 3, 1, 2, 1, 1, 2, 4, 5, 5, 2, 2, 3, 1, 2 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000` `D. A. Goldston, S. W. Graham, J. Pintz and C. Y. Yildirim, Small gaps between primes and almost primes`
	FORMULA	`a(n) = A001358(n+1) - A001358(n)`
	EXAMPLE	`a(6) = A001358(7) - A001358(6) = 21 - 15 = 6.`
	MATHEMATICA	`Differences[Select[Range[329], PrimeOmega[#] == 2 &]] (* Arkadiusz Wesolowski, Nov 24 2011 *)`
	PROG	`(PARI) {spg(m)=local(a, b); a=0; b=4; for(n=5, m, if(bigomega(n) == 2, a=n; print1(a-b", "); b=a; ))}`
	CROSSREFS	`Cf. A001358` `Sequence in context: A002946 A205790 A035426 * A195164 A087088 A104705` `Adjacent sequences: A065513 A065514 A065515 * A065517 A065518 A065519`
	KEYWORD	`easy,nonn`
	AUTHOR	`Lior Manor (lior.manor(AT)gmail.com) Nov 27 2001`
	EXTENSIONS	`More terms from Jason Earls (zevi_35711(AT)yahoo.com), Jul 24 2003`

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Last modified February 16 04:47 EST 2012. Contains 205860 sequences.