A254377 - OEIS

A254377

Characteristic function of A230709: a(n) = 1 if n is either evil (A001969) or even odious (A128309), otherwise 0 (when n is odd odious).

1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1

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OFFSET

COMMENTS

A228495 is the characteristic function of the odd odious numbers (A092246).

A230709 is the union of even odious (A128309) and evil (A001969) numbers.

This sequence equals the parity of A003071, A093431, A122248, and A175186 (allowing for offsets).

Run lengths are given by A254378.

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..65537

Tanya Khovanova, There are no coincidences, arXiv preprint 1410.2193 [math.CO], 2014.

Index entries for characteristic functions.

FORMULA