id:A061925 - OEIS Search Results

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A061925

Ceiling[n^2/2]+1.

+0
9

1, 2, 3, 6, 9, 14, 19, 26, 33, 42, 51, 62, 73, 86, 99, 114, 129, 146, 163, 182, 201, 222, 243, 266, 289, 314, 339, 366, 393, 422, 451, 482, 513, 546, 579, 614, 649, 686, 723, 762, 801, 842, 883, 926, 969, 1014, 1059, 1106, 1153, 1202, 1251, 1302, 1353, 1406 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(n+1) gives index of the first occurrence of n in A100795. - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 05 2004` `First term in each group in A074148. - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 28 2002`
	FORMULA	`a(n) = a(n-1)+2[(n-1)/2]+1 = A061926(3, k) = 2A002620(n+1)-(n-1) = A000982(n)+1. a(2n) = a(2n-1)+2n-1 = 2n^2+1 = A058331(n); a(2n+1) = a(2n)+2n+1 = 2(n^2+n+1) = A051890(n+1).`
	CROSSREFS	`Cf. A100795, A074148.` `Cf. A074147, A074148, A074149.` `Sequence in context: A008823 A127719 A074150 this_sequence A073736 A101593 A084628` `Adjacent sequences: A061922 A061923 A061924 this_sequence A061926 A061927 A061928`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), May 17 2001`
	EXTENSIONS	`Edited by njas at the suggestion of Andrew Plewe, Jun 09 2007`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

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