A161974 a(n) = number of equalities of the form A010060(n+k) = A010060(n), k=1,2,3.

1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1

Offset: 0

Author

Vladimir Shevelev, Jun 23 2009

Keywords

• nonn
• easy

Comments

See comment to A161916. 3-a(n) is the number of equalities of kind A010060(n+k) = 1-A010060(n), k=1,2,3.

Crossrefs

Cf. A161916, A161890, A161824, A161817, A161674, A161673, A161639, A161641, A161627, A161579, A161580, A121539, A131323, A036554, A010060.

Programs

PARI

a(n)=sum(k=1,3,hammingweight(n)%2==hammingweight(n+k)%2) \\ Charles R Greathouse IV, Aug 20 2013

Extensions

Missing a(24)=1 inserted by Georg Fischer, Jun 21 2024