Category:Definitions/Ramanujan Phi Function

This category contains definitions related to Ramanujan Phi Function.
Related results can be found in Category:Ramanujan Phi Function.

The two argument Ramanujan phi function, $\map \phi {a, n}$, is defined for $a \in \Z, a > 1$ as:

$\ds \map \phi {a, n} = 1 + 2 \sum_{k \mathop = 1}^n \dfrac 1 {\paren {a k }^3 - a k}$