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A102393 A wicked evil sequence. 10
1, 0, 0, 4, 0, 6, 7, 0, 0, 10, 11, 0, 13, 0, 0, 16, 0, 18, 19, 0, 21, 0, 0, 24, 25, 0, 0, 28, 0, 30, 31, 0, 0, 34, 35, 0, 37, 0, 0, 40, 41, 0, 0, 44, 0, 46, 47, 0, 49, 0, 0, 52, 0, 54, 55, 0, 0, 58, 59, 0, 61, 0, 0, 64, 0, 66, 67, 0, 69, 0, 0, 72, 73, 0, 0, 76, 0, 78, 79, 0, 81, 0, 0, 84, 0, 86 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

COMMENTS

Elements of A026147 (evil numbers plus one) appear at positions indexed by the evil numbers A001969, 0 otherwise. A000027(n)=A102393(n)+A102394(n).

Comment from Jeremy Gardiner, Dec 28 2008: The following sequences all appear to have the same parity: A003071, A029886, A061297, A092524, A093431, A102393, A104258, A122248, A128975.

FORMULA

a(n)=(n+1)(1+(-1)^A000120(n))/2; a(n)=(n+1)(1+(-1)^A010060(n))/2.

CROSSREFS

Cf. A102391.

Sequence in context: A019629 A073759 A066760 * A019833 A155743 A194193

Adjacent sequences:  A102390 A102391 A102392 * A102394 A102395 A102396

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jan 06 2005

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Last modified February 17 04:56 EST 2012. Contains 205985 sequences.