id:A051827 - OEIS Search Results

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

+0
2

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

	OFFSET	`1,2`
	COMMENT	`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: A135177 A137958 A064852 this_sequence A007711 A020114 A009597` `Adjacent sequences: A051824 A051825 A051826 this_sequence 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 September 5 01:44 EDT 2008. Contains 143476 sequences.

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