id:A077812 - OEIS Search Results

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Square-free kernel of numbers containing in their decimal representation only the digits 0 and 1.

+0
2

1, 10, 11, 10, 101, 110, 111, 10, 1001, 1010, 1011, 110, 1101, 1110, 1111, 10, 10001, 10010, 10011, 1010, 10101, 10110, 10111, 110, 11001, 11010, 1001, 1110, 11101, 11110, 11111, 10, 100001, 100010, 100011, 10010, 100101, 100110, 100111, 1010 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Not all square-free kernels of numbers containing in their decimal representation only the digits 0 and 1 also have this property: a(511) = A007947(A007088(511)) = A007947(111111111) = A007947(3337333667) = 337*333667 = 37037037.`
	FORMULA	`a(n) = A007947(A007088(n)).`
	EXAMPLE	`a(20) = A007947(A007088(20)) = A007947(10100) = A007947(2255101) = 25101 = 1010.`
	CROSSREFS	`Cf. A077813, A077805, A077806.` `Sequence in context: A085214 A082492 A004053 this_sequence A004288 A065016 A087381` `Adjacent sequences: A077809 A077810 A077811 this_sequence A077813 A077814 A077815`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 16 2002`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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