A185012 Characteristic function of two.

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

Offset

0,1

Comments

The Euler transformation of this sequence is A059841.

This sequence is the first differences of A157928.

Links

Table of n, a(n) for n=0..85.

Index entries for linear recurrences with constant coefficients, signature (1).

Mathematica

PadRight[{0, 0, 1}, 100] (* Paolo Xausa, May 06 2026 *)

Prog

(Python)
def A185012(n): return int(n==2) # Chai Wah Wu, Feb 04 2022

Crossrefs

Cf. A171386.

Characteristic function of g: A000007 (g=0), A063524 (g=1), this sequence (g=2), A185013 (g=3), A185014 (g=4), A185015 (g=5), A185016 (g=6), A185017 (g=7).

Sequence in context: A056029 A204547 A072609 * A328794 A185706 A358759

Adjacent sequences: A185009 A185010 A185011 * A185013 A185014 A185015

Keyword

nonn,easy

Author

Jason Kimberley, Oct 11 2011

Status

approved