shows the sum of the factors (listing all the factors in the sum) and the aliquot sum
tells you whether a number is abundant, deficient or perfect (or prime)
the chart can be dragged across to the left (see what happens at 360)
I have mentioned elsewhere my enthusiasm for using Alec McEachran's 'Primitives' application (that can be viewed full screen)
composite numbers being shown in an interesting form
another representation shows the numbers on a grid, with the prime factorisation indicated by sectors
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