A205003 The index jA205002) for which such j exists, and s(k)=k(k+1)/2.

1, 1, 2, 3, 1, 2, 2, 7, 1, 1, 4, 2, 5, 1, 3, 15, 7, 2, 8, 1, 5, 3, 10, 6, 2, 4, 1, 4, 13, 3, 14, 31, 2, 6, 1, 3, 17, 7, 3, 5, 19, 2, 20, 1, 4, 9, 22, 14, 3, 7, 5, 2, 25, 1, 8, 4, 6, 12, 28, 3

Offset: 1

Author

Clark Kimberling, Jan 21 2012

Keywords

• nonn

Comments

For a guide to related sequences, see A204892.

Crossrefs

Cf. A204892, A205002.

Programs

Mathematica

(See the program at A205002.)