Numbers k such that k and usigma(k) have the same set of prime divisors, where usigma(k) is the sum of unitary divisors of k (A034448).
A329858
Numbers k such that k and usigma(k) have the same set of prime divisors, where usigma(k) is the sum of unitary divisors of k (A034448).
Terms
- a(0) =1a(1) =6a(2) =24a(3) =60a(4) =90a(5) =180a(6) =360a(7) =378a(8) =816a(9) =1056a(10) =1512a(11) =3780a(12) =9100a(13) =10500a(14) =12240a(15) =13230a(16) =15750a(17) =15840a(18) =26460a(19) =31500a(20) =36750a(21) =40950a(22) =46494a(23) =51408a(24) =52920a(25) =63000a(26) =63700a(27) =66528a(28) =73500a(29) =87360
External references
- oeis: A329858