Wolfram Cloud Document

In[]:=

Out[]=

{{1,1},{1,2},{1,3},{1,4},{1,5},{1,6},{1,7},{1,8},{1,9},{3,1},{3,2},{9,1}}

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{{1,1},{1,2},{1,3},{1,4},{2,1},{4,1}}

Out[]=

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In[]:=

Cusp[33]

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{{1,1},{3,1},{11,1},{33,1}}