A111412 f(f(n+1))-f(f(n)), where f(m) = wt(m) = A000120(m).

1, 0, 0, 0, 0, 0, 1, -1, 0, 0, 1, -1, 1, 0, -1, 0, 0, 0, 1, -1, 1, 0, -1, 0, 1, 0, -1, 1, -1, 0, 1, -1, 0, 0, 1, -1, 1, 0, -1, 0, 1, 0, -1, 1, -1, 0, 1, -1, 1, 0, -1, 1, -1, 0, 1, 0, -1, 0, 1, -1, 1, 0, 0, -1, 0, 0, 1, -1, 1, 0, -1, 0, 1, 0, -1, 1, -1, 0, 1, -1, 1, 0, -1, 1, -1, 0, 1, 0, -1, 0, 1, -1, 1, 0, 0, -1, 1, 0, -1, 1, -1

Offset

0,1

Links

Table of n, a(n) for n=0..100.

Mathematica

f[n_] := DigitCount[n, 2, 1]; a[n_] := f[f[n+1]] - f[f[n]]; Array[a, 100, 0] (* Amiram Eldar, Jul 23 2023 *)

Crossrefs

Cf. A000120.

Sequence in context: A266243 A266608 A333818 * A080111 A204545 A185116

Adjacent sequences: A111409 A111410 A111411 * A111413 A111414 A111415

Keyword

sign,base

Author

N. J. A. Sloane, Nov 12 2005

Extensions

Definition corrected by N. J. A. Sloane, Feb 14 2018

Status

approved