id:A139117 - OEIS Search Results

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Triangular numbers (A000217) with indices A000043.

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3, 6, 15, 28, 91, 153, 190, 496, 1891, 4005, 5778, 8128, 135981, 184528, 818560, 2427706, 2602621, 5176153, 9046131, 9783636, 46943205, 49416711, 62871291, 198751953, 235477551, 269340445, 990013753, 3718970646, 6105511756 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=A000217(A000043(n)).`
	EXAMPLE	`a(4)=28 because A000043(4)=7 and the 7th triangular number A000217(7) is 28.`
	CROSSREFS	`Cf. A000217, A000396, A034953.` `Sequence in context: A034953 A086737 A063834 this_sequence A066708 A034464 A116696` `Adjacent sequences: A139114 A139115 A139116 this_sequence A139118 A139119 A139120`
	KEYWORD	`nonn`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), May 08 2008`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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