A194698 a(n) = floor((n - 1)/12) - floor((n^2 - 1)/(24*n)).

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4

Offset: 1

Author

Omar E. Pol, Jan 18 2012

Keywords

• nonn
• easy

Comments

A similar formula for prime indices is mentioned in the abstract of the Folson-Kent-Ono paper (See A194699).

Crossrefs

Cf. A000041, A194699.

Programs

Mathematica

Table[Floor[(n-1)/12]-Floor[(n^2-1)/(24n)],{n,90}] (* Harvey P. Dale, Oct 23 2021 *)