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04-14-2021, 07:14 PM
Baler
Planar Protector
Join Date: Mar 2014
Posts: 9,520
84
the sum of the first seven triangular numbers (making it a tetrahedral number).
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No longer active, thank you for the years of fun.
No alt account and I do not post on the P99 forums.
Told this to Rogean, Nilbog & Menden.
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