658 = 2 x 7 x 47.
658 is the number of triangles of any size contained in the triangle of side 13 on a triangular grid.
658 is the sum of six positive cubes in exactly three ways.
PT-658, built in 1945, is a historic naval ship now being restored, in Portland, Ore.
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658 otras propiedades:
658 divide a 95^3-1
658=3^6-71
658^2=2258^2-2160^2
658^2=108242^2-108240^2
658^3=216811^2-216153^2
658^4=142445485^2-14244827^2
658^5=142661638^2-142228674^2
Rafael Parra de Barcelona
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