a(n) = the smallest natural numbers m such that product of harmonic mean of the divisors of n and harmonic mean of the divisors of m are integers.
A176802
a(n) = the smallest natural numbers m such that product of harmonic mean of the divisors of n and harmonic mean of the divisors of m are integers.
Terms
- a(0) =1a(1) =3a(2) =2a(3) =7a(4) =28a(5) =1a(6) =4a(7) =420a(8) =182a(9) =27a(10) =270a(11) =14a(12) =126a(13) =4a(14) =6a(15) =31a(16) =1638a(17) =91a(18) =980a(19) =7a(20) =32a(21) =84a(22) =30240a(23) =15a(24) =248a(25) =63a(26) =10a(27) =1a(28) =8190a(29) =3
External references
- oeis: A176802