Concatenation of first n elements of the sigma function, where sigma(n) is the sum of divisors of n.

A132930

Concatenation of first n elements of the sigma function, where sigma(n) is the sum of divisors of n.

Terms

    a(0) =1a(1) =13a(2) =134a(3) =1347a(4) =13476a(5) =1347612a(6) =13476128a(7) =1347612815a(8) =134761281513

External references