A039974 An example of a d-perfect sequence.

1, 1, 0, 2, 0, 2, 0, 1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 1, 0, 2, 0, 2, 0, 1, 0, 2, 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, 2, 0, 1, 0, 2, 0, 2, 0, 1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 1, 0, 2, 0, 2, 0, 1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset

1,4

Comments

Is this 1 followed by the entries of A039973? - R. J. Mathar, Aug 10 2025

Links

Table of n, a(n) for n=1..105.

D. Kohel, S. Ling and C. Xing, Explicit Sequence Expansions, in Sequences and their Applications, C. Ding, T. Helleseth, and H. Niederreiter, eds., Proceedings of SETA'98 (Singapore, 1998), 308-317, 1999. DOI: 10.1007/978-1-4471-0551-0_23

Formula

a(n) = ((-1)^(n+1)*A006318(n)) mod 3. - Christian G. Bower, Jun 12 2005

Crossrefs

Sequence in context: A214332 A164734 A090193 * A039973 A035171 A352567

Adjacent sequences: A039971 A039972 A039973 * A039975 A039976 A039977

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Christian G. Bower, Jun 12 2005

Status

approved