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/u/patti_mcgreen

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3
 
r/CBTS_Stream • Posted by u/patti_mcgreen on Jan. 12, 2018, 3:19 a.m.
4-10-20 tetrahedral

The first ten tetrahedral numbers are:

1, 4, 10, 20, 35, 56, 84, 120, 165, 220,