A051827 - OEIS

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A051827

Number of numbers below 10^n with nonzero multiplicative digital root 7.

1, 4, 18, 104, 770, 7188, 71267, 668712, 5784858, 46456730, 351209716, 2538926040, 17934291011, 128545882129, 994784980860, 8902285643456 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Conjectured o(10^n)`
	REFERENCES	`William Mayne, sci.math, Jun 15 1991`
	FORMULA	`# { i : 10^(n-1) < i < 10^n and A051802(i)=7 }`
	CROSSREFS	`Cf. A051802, A051809, A051818.` `Sequence in context: A064852 A191365 A159666 * A007711 A020114 A009597` `Adjacent sequences: A051824 A051825 A051826 * A051828 A051829 A051830`
	KEYWORD	`nonn,base,hard`
	AUTHOR	`Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil), Dec 09 1999`

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Last modified February 17 02:08 EST 2012. Contains 205978 sequences.