Numbers of the form Sum_{j=1..k} sigma(j) that are square.
A062407
Numbers of the form Sum_{j=1..k} sigma(j) that are square.
Terms
- a(0) =1a(1) =4a(2) =2304a(3) =24964a(4) =73441a(5) =1560001a(6) =132549169a(7) =1626428241a(8) =147805647025
External references
- oeis: A062407