Indecomposable sigma-powerful numbers: powerful numbers k such that sigma(k) is also powerful, but restricted to terms that are not the product of 2 terms > 1 of A337044.
A337045
Indecomposable sigma-powerful numbers: powerful numbers k such that sigma(k) is also powerful, but restricted to terms that are not the product of 2 terms > 1 of A337044.
Terms
- a(0) =81a(1) =343a(2) =400a(3) =9261a(4) =189728a(5) =224939a(6) =972000a(7) =1705636a(8) =2205472a(9) =3087000a(10) =3591200a(11) =3648100a(12) =7968032a(13) =13645088a(14) =15350724a(15) =21161304a(16) =24240600a(17) =25992000a(18) =26680500a(19) =29184800a(20) =32832900a(21) =48586824a(22) =51595489a(23) =80802000a(24) =103617387a(25) =109215352a(26) =110215125a(27) =119604096a(28) =122805792
External references
- oeis: A337045