id:A069499 - OEIS Search Results

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Triangular numbers of the form 21k.

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21, 105, 210, 231, 378, 630, 861, 903, 1176, 1596, 1953, 2016, 2415, 3003, 3486, 3570, 4095, 4851, 5460, 5565, 6216, 7140, 7875, 8001, 8778, 9870, 10731, 10878, 11781, 13041, 14028, 14196, 15225, 16653, 17766, 17955, 19110, 20706, 21945 (list; graph; listen)

	OFFSET	`0,1`
	MAPLE	`a[0] := 0:a[1] := 6:a[2] := 14:a[3] := 20:a[4] := 21:a[5] := 27:a[6] := 35:a[7] := 41:seq((42(floor(i/8))+a[i mod 8])(42*(floor(i/8))+a[i mod 8]+1)/2, i=1..100);`
	CROSSREFS	`Sequence in context: A044272 A044653 A076454 this_sequence A068142 A126229 A060537` `Adjacent sequences: A069496 A069497 A069498 this_sequence A069500 A069501 A069502`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 30 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Apr 01 2002`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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