### Alexander Bogomolny

Shared publicly -A curious property of number 4: 4 = k^2 - (k+1)^2 - (k+2)^2 + (k+3)^2 and what follows from it

http://www.cut-the-knot.org/arithmetic/algebra/PropertyOfNumber4.shtml

http://www.cut-the-knot.org/arithmetic/algebra/PropertyOfNumber4.shtml

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