id:A051820 - OEIS Search Results

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Number of n-digit numbers with nonzero multiplicative digital root 9.

+0
2

1, 4, 25, 180, 1640, 17678, 213761, 2572363, 28717151, 295374892, 2863710220, 27059835840, 257084859669, 2498594395926, 24825380748687, 249116120158421 (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)=9 }`
	CROSSREFS	`Cf. A051802, A051811, A051829.` `Sequence in context: A084210 A093683 A006348 this_sequence A166697 A054368 A135147` `Adjacent sequences: A051817 A051818 A051819 this_sequence A051821 A051822 A051823`
	KEYWORD	`nonn,base,hard`
	AUTHOR	`Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil), Dec 09 1999`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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