id:A122255 - OEIS Search Results

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Characteristic function of numbers with 3-smooth Euler's totient (A000010).

+0
5

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(A122254(n)) = a(A048135(n)) = 1; a(A048136(n)) = 0;` `a(n) = if n=1 then 0 else A122256(n) - A122256(n-1);` `a(n) = A122261(n) for n < 25.`
	FORMULA	`a(n) = if A006530(A000010(n)) <= 3 then 1 else 0.`
	CROSSREFS	`Sequence in context: A105586 A136522 A086299 this_sequence A122261 A014922 A014988` `Adjacent sequences: A122252 A122253 A122254 this_sequence A122256 A122257 A122258`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Aug 29 2006`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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