Number Fifteen
0:19
YouTubeKandi Brian
Number Fifteen
Number Fifteen in Decimal, Hex, and Binary 15 is a triangular number. It's the sum of the first five counting numbers: 1 + 2 + 3 + 4 + 5 = 15. Picture bowling pins or billiard balls racked in a triangle — five rows give you exactly fifteen. It's also a hexagonal number, and it's the smallest number that is the product of two distinct odd ...
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