User blog:Dhacorrea/Sumgogopyr

Sumgoogogoogopyrnum is defined as the summation of the n-th n-gonal pyramidal numbers with n from 3 to googol.

\begin{eqnarray*} Sumgoogogoogopyrnum &=& \displaystyle\sum^{10^{100}}_{n = 3} \ [3.n^{2} + n^{3}.(n-2) - n.(n-5)]/6 \\ \end{eqnarray*} 