A205131 The index jA205130) for which such j exists, and s(k)=2*k^2-k, the k-th hexagonal number.

1, 1, 2, 1, 1, 3, 1, 1, 2, 3, 2, 2, 3, 1, 3, 1, 4, 1, 4, 2, 5, 2, 5, 3, 6, 9, 1, 7, 7, 3, 7, 1, 8, 12, 3, 5, 9, 4, 2, 5, 10, 6, 10, 1, 1, 5, 11, 2, 2, 4, 3, 8, 13, 6, 6, 5, 2, 21, 14, 2

Offset: 1

Author

Clark Kimberling, Jan 25 2012

Keywords

• nonn

Comments

For a guide to related sequences, see A204892.

Crossrefs

Cf. A205130, A204892.

Programs

Mathematica

(See the program at A205130.)