A notable paper [Ramanujan] wrote with Hardy concerns the partition function (PartitionsP in the Wolfram Language) that counts the number of ways an integer can be written as a sum of positive integers. …

In Ramanujan’s day, computing the exact value of PartitionsP[200] was a big deal — and the climax of his paper. But now, thanks to Ramanujan’s method, it’s instantaneous:

In[1]:= PartitionsP[200]
Out[1]= 3 972 999 029 388

— Stephen Wolfram, Who Was Ramanujan?