Friday, June 4, 2010

663

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 generalized Catalan number C(15,3).

663 is the numerical equivalent of ONE on a touch-tone telephone.

1 comment:

Anonymous said...

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