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0,4
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.
Table of n, a(n) for n=0..85.
Tanya Khovanova, There are no coincidences, arXiv preprint 1410.2193, 2014
a(n)=(n+1)(1+(-1)^A000120(n))/2; a(n)=(n+1)(1+(-1)^A010060(n))/2.
Cf. A102391.
Sequence in context: A019629 A073759 A066760 * A228131 A019833 A155743
Adjacent sequences: A102390 A102391 A102392 * A102394 A102395 A102396
easy,nonn
Paul Barry, Jan 06 2005
approved