Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate
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).
The following sequences all appear to have the same parity: A003071, A029886, A061297, A092524, A093431, A102393, A104258, A122248, A128975. - Jeremy Gardiner, Dec 28 2008
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