Composite numbers k such that the sum of the proper divisors of k not including 1, (Chowla's function, A048050) and their product (A007956) are both perfect squares.
A064180
Composite numbers k such that the sum of the proper divisors of k not including 1, (Chowla's function, A048050) and their product (A007956) are both perfect squares.
Terms
- a(0) =117a(1) =208a(2) =292a(3) =320a(4) =475a(5) =539a(6) =549a(7) =567a(8) =873a(9) =964a(10) =1737a(11) =2107a(12) =2692a(13) =2997a(14) =3573a(15) =3904a(16) =4477a(17) =4802a(18) =5275a(19) =5284a(20) =5968a(21) =6057a(22) =7267a(23) =7488a(24) =7492a(25) =9189a(26) =9457a(27) =9475a(28) =10084a(29) =10377
External references
- oeis: A064180