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Old 08-05-2009, 04:54 AM   #18 (permalink)

Join Date: Apr 2009
Posts: 154

[edit] In mathematics
Eighty-four is the sum of the first seven triangular numbers (making it a tetrahedral number), as well as the sum of a twin prime (41 + 43). Being thrice a perfect number, 84 is itself a semiperfect number.

Eighty-four is also the lim sup of the largest finite subgroup of the mapping class group of a genus g surface divided by g.
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