A085242 a(n) = A085239(n+1) - 2.

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

Offset: 1

Author

Reinhard Zumkeller, Jun 22 2003

Keywords

• nonn

Crossrefs

Cf. A085239.

Programs

PARI

upto(L) = my(v2=2, v3=1, r=List()); while(v3Ruud H.G. van Tol, May 10 2024

Python

from sympy import integer_log
def A085242(n): return int(6**integer_log(m:=3**n,6)[0]<<1>=m) # Chai Wah Wu, Feb 05 2025

Extensions

Name corrected by Ruud H.G. van Tol, May 10 2024