Numbers n such that usigma(usigma(n))/usigma(n) > usigma(usigma(m))/usigma(m) for all m < n, where usigma(n) is the sum of unitary divisors of n (A034448).
A289126
Numbers n such that usigma(usigma(n))/usigma(n) > usigma(usigma(m))/usigma(m) for all m < n, where usigma(n) is the sum of unitary divisors of n (A034448).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =18a(4) =164a(5) =1538a(6) =20018a(7) =408404a(8) =7759748a(9) =148728578a(10) =6976017044a(11) =7317446132
External references
- oeis: A289126