id:A051812 - OEIS Search Results

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Number of n-digit numbers with nonzero multiplicative digital root 1.

+0
2

1, 5, 24, 243, 3048, 35224, 374890, 3766188, 36537927, 348892847, 3315037530, 31399344551, 295789894509, 2769886220702, 25882768895688, 243033400452156 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Not counting zero as a one-digit number`
	REFERENCES	`William Mayne, sci.math, Jun 15 1991`
	FORMULA	`# { i : 10^(n-1) < i < 10^n and A051802(i)=1 }`
	CROSSREFS	`Cf. A051802, A051803, A051821.` `Sequence in context: A009676 A027851 A120765 this_sequence A003224 A156310 A142725` `Adjacent sequences: A051809 A051810 A051811 this_sequence A051813 A051814 A051815`
	KEYWORD	`nonn,base,hard`
	AUTHOR	`Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil), Dec 09 1999`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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