A074239 - OEIS

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A074239

Related to cumulative number of non-twin primes.

0, 0, 0, 1, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 8, 9, 9, 10, 11, 11, 12, 13, 14, 15, 16, 16, 17, 17, 18, 19, 20, 21, 21, 22, 22, 23, 24, 25, 26, 27, 27, 28, 28, 29, 29, 30, 31, 32, 32, 33, 34, 34, 35, 36, 37, 38, 38, 39, 40, 40, 41, 42, 43, 43, 44, 45, 46, 47, 47, 48, 49, 50 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,6`
	LINKS	`Paul Nanninga, Table of n, a(n) for n = 0..100`
	FORMULA	`Take the sequence of odd primes p(n); set a(0) = 0; if p(n+1)-p(n)=2 a(n+1) = a(n), if p(n+1)-p(n) > 2 a(n+1) = a(n) + 1.`
	CROSSREFS	`Sequence in context: A135672 A064506 A082774 * A188511 A064488 A049472` `Adjacent sequences: A074236 A074237 A074238 * A074240 A074241 A074242`
	KEYWORD	`easy,nonn`
	AUTHOR	`Rudi Huysmans (rudi.huysmans(AT)pandora.be), Sep 18 2002`

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Last modified February 15 06:55 EST 2012. Contains 205694 sequences.