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#theorem

36 posts9 participants6 posts today

A003601: Numbers j such that the average of the divisors of j is an integer: sigma_0(j) divides sigma_1(j). Alternatively, numbers j such that tau(j) (A000005(j)) divides sigma(j) (A000203(j))

3D graph, threejs - webGL ➡️ decompwlj.com/3Dgraph/A003601.
3D graph Gen, threejs animation ➡️ decompwlj.com/3DgraphGen/A0036
2D graph, first 500 terms ➡️ decompwlj.com/2Dgraph500terms/