663 = 3 x 13 x 17.
663 is a number that cannot be written as a sum of three squares.
663 has the representation 663 = 36 - 66.
663 is the numerical equivalent of ONE on a touch-tone telephone.Source: Number Gossip
663 is the numerical equivalent of ONE on a touch-tone telephone.
1 comment:
663^2=63^2+660^2
663^2=255^2+612^2
663^2=312^2+585^2
663^2=420^2+513^2
663^2=67*3^8-18
Rafael de Barcelona
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