id:A051821 - OEIS Search Results

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Number of numbers below 10^n with nonzero multiplicative digital root 1 (not counting 0).

+0
2

1, 6, 30, 273, 3321, 38545, 413435, 4179623, 40717550, 389610397, 3704647927, 35103992478, 330893886987, 3100780107689, 28983549003377, 272016949455533 (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)=1 }`
	CROSSREFS	`Cf. A051802, A051803, A051812.` `Sequence in context: A133668 A121772 A052585 this_sequence A099031 A066108 A110374` `Adjacent sequences: A051818 A051819 A051820 this_sequence A051822 A051823 A051824`
	KEYWORD	`nonn,base,hard`
	AUTHOR	`Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil), Dec 09 1999`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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