id:A077809 - OEIS Search Results

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Number of divisors of numbers containing in their decimal representation only the digits 0 and 1.

+0
2

1, 4, 2, 9, 2, 8, 4, 16, 8, 8, 4, 18, 4, 16, 4, 25, 4, 32, 8, 18, 16, 16, 2, 32, 8, 16, 12, 36, 4, 16, 4, 36, 4, 16, 16, 72, 8, 32, 8, 32, 8, 64, 4, 36, 16, 8, 2, 50, 8, 32, 8, 36, 4, 48, 4, 64, 4, 16, 4, 36, 4, 16, 32, 49, 4, 16, 4, 36, 4, 64, 4, 128, 4, 32, 16, 72, 4, 32, 4, 50, 4, 32, 6 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = A000005(A007088(n)).`
	EXAMPLE	`a(6) = A000005(A007088(6)) = A000005(110) = 8, as 110 has divisors: 1, 2, 5, 10, 11, 22, 55, and 110.`
	CROSSREFS	`Cf. A077810.` `Adjacent sequences: A077806 A077807 A077808 this_sequence A077810 A077811 A077812` `Sequence in context: A067721 A021237 A115881 this_sequence A060734 A075594 A076022`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 16 2002`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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