a(n) is the minimum number with exactly n triples (u,m,v) of divisors such that u < v and m^2 is the harmonic mean of u^2 and v^2.
A376713
a(n) is the minimum number with exactly n triples (u,m,v) of divisors such that u < v and m^2 is the harmonic mean of u^2 and v^2.
Terms
- a(0) =35a(1) =70a(2) =140a(3) =210a(4) =560a(5) =420a(6) =2240a(7) =840a(8) =1260a(9) =1680a(10) =35840a(11) =2100a(12) =143360a(13) =6720a(14) =5040a(15) =4200a(16) =1709435a(17) =6300a(18) =645575a(19) =8400a(20) =20160a(21) =77350a(22) =36728125a(23) =12600a(24) =45360a(25) =430080a(26) =31500a(27) =33600a(28) =1117484375a(29) =25200
External references
- oeis: A376713