id:A133311 - OEIS Search Results

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The nonnegative integers reordered in groups of 5 even numbers followed by 5 odd numbers.

+0
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0, 2, 4, 6, 8, 1, 3, 5, 7, 9, 10, 12, 14, 16, 18, 11, 13, 15, 17, 19, 20, 22, 24, 26, 28, 21, 23, 25, 27, 29, 30, 32, 34, 36, 38, 31, 33, 35, 37, 39, 40, 42, 44, 46, 48, 41, 43, 45, 47, 49, 50, 52, 54, 56, 58, 51, 53, 55, 57, 59, 60, 62, 64, 66, 68, 61, 63, 65, 67, 69, 70, 72, 74 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)= g10+2r-9*floor(r/5), where g=floor(n/10) and r=n mod 10.` `a(n)= a(n-10)+10.` `O.g.f.: x(2+2x+2x^2+2x^3-7x^4+2x^5+2x^6+2x^7+2x^8+x^9)/( (-1+x)^2 (1+x)(x^4+x^3+x^2+x+1)(x^4-x^3+x^2-x+1)). - R. J. Mathar (mathar(AT)strw.liedenuniv.nl), Jul 22 2008`
	CROSSREFS	`Cf. A001477.` `Sequence in context: A032763 A146082 A004092 this_sequence A088402 A077492 A007396` `Adjacent sequences: A133308 A133309 A133310 this_sequence A133312 A133313 A133314`
	KEYWORD	`nonn,easy`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Oct 18 2007`
	EXTENSIONS	`Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 22 2008`

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Last modified December 4 20:00 EST 2008. Contains 151309 sequences.

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