id:A117650 - OEIS Search Results

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Heptagonal numbers for which the sum of the digits is also a heptagonal number.

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1, 7, 34, 189, 403, 783, 1782, 2673, 3186, 3744, 4347, 6426, 7209, 8037, 8910, 10791, 11122, 12852, 13950, 15093, 16281, 17514, 21022, 21483, 24354, 27405, 30636, 32319, 34047, 35820, 39501, 41409, 43362, 45360, 47403, 51624, 53802, 56025 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`196981 is in the sequence because it is a heptagonal number and the sum of its digits (34) is also a heptagonal number`
	CROSSREFS	`Cf. A000566.` `Sequence in context: A027209 A080048 A027233 this_sequence A144038 A027842 A027683` `Adjacent sequences: A117647 A117648 A117649 this_sequence A117651 A117652 A117653`
	KEYWORD	`nonn,base`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 11 2006`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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