id:A051815 - OEIS Search Results

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Number of n-digit numbers with nonzero multiplicative digital root 4.

+0
2

1, 12, 105, 780, 5452, 39979, 336081, 3263355, 34518027, 372779338, 3957184040, 40729856248, 406862880846, 3979167973684, 38556471560342, 374259579575061 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`William Mayne, sci.math, Jun 15 1991`
	FORMULA	`# { i : 10^(n-1) < i < 10^n and A051802(i)=4 }`
	CROSSREFS	`Cf. A051802, A051806, A051824.` `Sequence in context: A003431 A094530 A157024 this_sequence A004321 A016223 A027142` `Adjacent sequences: A051812 A051813 A051814 this_sequence A051816 A051817 A051818`
	KEYWORD	`nonn,base,hard`
	AUTHOR	`Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil), Dec 09 1999`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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