Numbers k such that the powerful part of the sum of divisors of k (A387726) is greater than or equal to k, and sigma(k) is not itself a powerful number.
A387729
Numbers k such that the powerful part of the sum of divisors of k (A387726) is greater than or equal to k, and sigma(k) is not itself a powerful number.
Terms
- a(0) =416a(1) =780a(2) =810a(3) =1312a(4) =1512a(5) =2754a(6) =3192a(7) =4194a(8) =4212a(9) =5460a(10) =6516a(11) =6800a(12) =8586a(13) =12012a(14) =12618a(15) =13200a(16) =14640a(17) =18234a(18) =18792a(19) =21060a(20) =21200a(21) =24138a(22) =24180a(23) =24400a(24) =27600a(25) =28008a(26) =28728a(27) =31428a(28) =31914a(29) =32580
External references
- oeis: A387729