id:A015221 - OEIS Search Results

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Odd square pyramidal numbers.

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1, 5, 55, 91, 285, 385, 819, 1015, 1785, 2109, 3311, 3795, 5525, 6201, 8555, 9455, 12529, 13685, 17575, 19019, 23821, 25585, 31395, 33511, 40425, 42925, 51039, 53955, 63365, 66729, 77531, 81375, 93665, 98021, 111895, 116795, 132349, 137825 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`Odd numbers of the form n(n+1)(2n+1)/6.`
	CROSSREFS	`Sequence in context: A132619 A085719 A129420 this_sequence A035305 A057722 A078216` `Adjacent sequences: A015218 A015219 A015220 this_sequence A015222 A015223 A015224`
	KEYWORD	`nonn,easy`
	AUTHOR	`Mohammad K. Azarian (ma3(AT)evansville.edu)`
	EXTENSIONS	`More terms from Erich Friedman (erich.friedman(AT)stetson.edu).`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

AT&T Labs Research