id:A051813 - OEIS Search Results

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Number of n-digit numbers with nonzero multiplicative digital root 2.

+0
2

1, 15, 208, 2389, 24845, 243697, 2348885, 22837227, 226507501, 2285904554, 23239957877, 235731610792, 2372897841904, 23686630752065, 235058927877399, 2327977363798607 (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)=2 }`
	CROSSREFS	`Cf. A051802, A051804, A051822.` `Sequence in context: A063906 A078265 A089138 this_sequence A028230 A122572 A067560` `Adjacent sequences: A051810 A051811 A051812 this_sequence A051814 A051815 A051816`
	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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