id:A076712 - OEIS Search Results

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Triangular numbers which are also happy numbers (cf. A007770).

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1, 10, 28, 91, 190, 496, 820, 946, 1128, 1275, 2080, 2211, 2485, 3321, 4278, 8128, 8256, 8778, 9591, 9730, 11476, 12090, 12880, 13203, 13366, 13530, 15753, 16471, 17205, 17578, 20910, 21115, 21321, 22791, 24753, 25651, 27261, 29890, 30135 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Shyam Sunder Gupta Fascinating Triangular Numbers`
	EXAMPLE	`a(4)=91: 91 is a triangular number and also a happy number as 9^2+1^2=82, 8^2+2^2=68, 6^2+8^2=100 and 1^2+0^2+0^2=1. So 91 is triangular happy number.`
	CROSSREFS	`Cf. A007770.` `Sequence in context: A048491 A124703 A126364 this_sequence A116973 A003665 A066527` `Adjacent sequences: A076709 A076710 A076711 this_sequence A076713 A076714 A076715`
	KEYWORD	`nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Oct 26 2002`

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Last modified September 5 19:27 EDT 2008. Contains 143485 sequences.

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