id:A111332 - OEIS Search Results

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Number of even numbers less than the n-th prime.

+0
3

0, 1, 2, 3, 5, 6, 8, 9, 11, 14, 15, 18, 20, 21, 23, 26, 29, 30, 33, 35, 36, 39, 41, 44, 48, 50, 51, 53, 54, 56, 63, 65, 68, 69, 74, 75, 78, 81, 83, 86, 89, 90, 95, 96, 98, 99, 105, 111, 113, 114, 116, 119, 120, 125, 128, 131, 134, 135, 138, 140, 141, 146, 153, 155, 156 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Same as A005097 ((odd primes - 1)/2) with a leading zero. (Lambert Klasen, Nov 06 2005)`
	FORMULA	`a(n)= prime_n - floor((prime_n)/2) - 1.`
	MATHEMATICA	`Table[Prime[n] - Floor[Prime[n]/2] - 1, {n, 65}] (* Robert G. Wilson v *)`
	CROSSREFS	`Sequence in context: A130290 A102781 A005097 this_sequence A139791 A027563 A000534` `Adjacent sequences: A111329 A111330 A111331 this_sequence A111333 A111334 A111335`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Nov 05 2005`
	EXTENSIONS	`Edited and extended by Lambert Klasen (lambert.klasen(AT)gmx.net) and Robert G. Wilson v (rgwv(at)rgwv.com), Nov 06 2005`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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