id:A083674 - OEIS Search Results

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Triangular numbers whose sum of divisors is also a triangular number.

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1, 36, 45, 23220, 105111, 135460, 2492028, 5286126, 6604795, 14308575, 45025305, 50516326, 54742416, 99017628, 108125865, 152486916, 386767578, 1083567628, 1561818105, 3169234305, 5005551540, 5718242211, 6125307903, 6479715880 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Shyam Sunder Gupta, Fascinating Triangular Numbers.`
	EXAMPLE	`a(2)=36 because sum of divisors of 36 =1+2+3+4+6+9+12+18+36=91, which is also a triangular number.`
	CROSSREFS	`Sequence in context: A144291 A068143 A167310 this_sequence A160063 A064597 A119850` `Adjacent sequences: A083671 A083672 A083673 this_sequence A083675 A083676 A083677`
	KEYWORD	`nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jun 15 2003`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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