a(n) is the least number k such that sigma(sigma(k) * k) > n * sigma(k) * k.
A368063
a(n) is the least number k such that sigma(sigma(k) * k) > n * sigma(k) * k.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =10a(4) =160a(5) =12155a(6) =26558675
External references
- oeis: A368063