id:A062728 - OEIS Search Results

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Write 0,1,2,3,4,... in a triangular spiral, then a(n) is the sequence found by reading the line from 0 in the direction 0,8,...

+0
2

0, 8, 25, 51, 86, 130, 183, 245, 316, 396, 485, 583, 690, 806, 931, 1065, 1208, 1360, 1521, 1691, 1870, 2058, 2255, 2461, 2676, 2900, 3133, 3375, 3626, 3886, 4155, 4433, 4720, 5016, 5321, 5635, 5958, 6290, 6631, 6981, 7340, 7708, 8085, 8471, 8866, 9270 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) = n*(9n+7)/2`
	EXAMPLE	`The spiral begins:` `..........15` `........16..14` `......17..3...13` `....18..4...2...12` `..19..5...0...1...11` `20..6...7...8...9...10`
	CROSSREFS	`Cf. A051682.` `Sequence in context: A031096 A123605 A089613 this_sequence A131423 A004640 A011924` `Adjacent sequences: A062725 A062726 A062727 this_sequence A062729 A062730 A062731`
	KEYWORD	`nonn,easy`
	AUTHOR	`Floor van Lamoen (fvlamoen(AT)hotmail.com), Jul 21 2001`

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

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