Numbers n such that sigma(sigma(n))-phi(phi(n)) = 3n.

A137600

Numbers n such that sigma(sigma(n))-phi(phi(n)) = 3n.

Terms

    a(0) =18a(1) =32a(2) =36a(3) =144a(4) =576a(5) =36864a(6) =589824a(7) =2359296a(8) =9663676416

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