id:A111333 - OEIS Search Results

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Number of odd numbers <= n-th prime.

+0
3

1, 2, 3, 4, 6, 7, 9, 10, 12, 15, 16, 19, 21, 22, 24, 27, 30, 31, 34, 36, 37, 40, 42, 45, 49, 51, 52, 54, 55, 57, 64, 66, 69, 70, 75, 76, 79, 82, 84, 87, 90, 91, 96, 97, 99, 100, 106, 112, 114, 115, 117, 120, 121, 126, 129, 132, 135, 136, 139, 141, 142, 147, 154, 156, 157 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`This is A006254 (numbers n such that 2n-1 is prime) with a leading 1. - Lambert Klasen (lambert.klasen(AT)gmx.net), Nov 06 2005`
	FORMULA	`a(n)=ceiling((prime_n)/2). - Robert G. Wilson v (rgwv(at)rgwv.com), Nov 07 2005`
	MATHEMATICA	`Table[ Ceiling[ Prime[n]/2], {n, 65}] (* Robert G. Wilson v *)`
	CROSSREFS	`Cf. A006254.` `Sequence in context: A001953 A079057 A006254 this_sequence A047701 A164528 A127963` `Adjacent sequences: A111330 A111331 A111332 this_sequence A111334 A111335 A111336`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Nov 05 2005`
	EXTENSIONS	`More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Nov 07 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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