id:A085780 - OEIS Search Results

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Numbers that are a product of 2 triangular numbers.

+0
2

0, 1, 3, 6, 9, 10, 15, 18, 21, 28, 30, 36, 45, 55, 60, 63, 66, 78, 84, 90, 91, 100, 105, 108, 120, 126, 135, 136, 150, 153, 165, 168, 171, 190, 198, 210 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`18=t(2)t(3)=36`
	PROGRAM	`(PARI) v=vector(300); vc=1; for (i=1, 20, for (j=i, 20, v[vc++ ]=t(i)*t(j))) v=vecsort(v)`
	CROSSREFS	`Cf. A000217, A085782.` `Adjacent sequences: A085777 A085778 A085779 this_sequence A085781 A085782 A085783` `Sequence in context: A061904 A111359 A085782 this_sequence A107084 A065940 A024795`
	KEYWORD	`nonn,more`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Jul 23 2003`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

AT&T Labs Research