id:A153639 - OEIS Search Results

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Evilness of triangular numbers.

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

	OFFSET	`0,1`
	COMMENT	`The evilness of a number is 1 if the number is evil and 0 otherwise. The number is evil if it has an even number of ones in its binary expansion.`
	MATHEMATICA	`od[n_] := Mod[Count[IntegerDigits[n, 2], 1], 2] Table[1 - od[n (n + 1)/2], {n, 0, 128}]`
	CROSSREFS	`A000217 Triangular numbers. A001969 Evil numbers.` `Sequence in context: A105594 A091949 A039984 this_sequence A103582 A129565 A121967` `Adjacent sequences: A153636 A153637 A153638 this_sequence A153640 A153641 A153642`
	KEYWORD	`nonn`
	AUTHOR	`Tanya Khovanova (tanyakh(AT)yahoo.com), Dec 29 2008`

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.

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