id:A108241 - OEIS Search Results

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Numbers n such that concatenating n and the sum of factorials of the digits of n produces a triangular number.

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0, 3, 18, 122, 2111, 12442, 40850, 113347, 202343, 233506, 332600, 435405, 525544, 546233, 554161, 716795, 1000334, 1016217, 1142240, 1244630, 2240515, 2414603, 3103412, 3203757, 3400440, 3413651, 3424213, 3461244, 4430222, 5226150 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`18 is in the sequence because 1!+8! = 40321 and 1918*1919/2 = 1840321.`
	CROSSREFS	`Cf. A061602, A109016.` `Adjacent sequences: A108238 A108239 A108240 this_sequence A108242 A108243 A108244` `Sequence in context: A127188 A074558 A074564 this_sequence A004987 A074557 A073971`
	KEYWORD	`base,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jun 17 2005`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

AT&T Labs Research