Numbers that are multi-perfect (A007691) and simultaneously harmonic (A001599).
A325025
Numbers that are multi-perfect (A007691) and simultaneously harmonic (A001599).
Terms
- a(0) =1a(1) =6a(2) =28a(3) =496a(4) =672a(5) =8128a(6) =30240a(7) =32760a(8) =2178540a(9) =23569920a(10) =33550336a(11) =45532800a(12) =142990848a(13) =459818240a(14) =1379454720a(15) =8589869056a(16) =14182439040a(17) =43861478400a(18) =51001180160a(19) =66433720320a(20) =137438691328a(21) =153003540480a(22) =403031236608a(23) =704575228896
External references
- oeis: A325025