id:A117832 - OEIS Search Results

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Triangular numbers for which the product of the digits is an octagonal number.

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0, 1, 10, 105, 120, 190, 210, 300, 106, 595, 630, 703, 780, 820, 903, 990, 1035, 1081, 1540, 1770, 1830, 2016, 2080, 2145, 2415, 2701, 2850, 3003, 3081, 3160, 3240, 3403, 3570, 4005, 4095, 4560, 4950, 5050, 5460, 6105, 6441, 6670, 6903, 7021, 7140, 7260 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`595 is in the sequence because (1) it is a triangular number, and (2) the product of its digits 595=225 is a octagonal number.`
	CROSSREFS	`Cf. A000217, A000567.` `Sequence in context: A036334 A110957 A077671 this_sequence A117833 A068093 A077369` `Adjacent sequences: A117829 A117830 A117831 this_sequence A117833 A117834 A117835`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 30 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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