a(n) is the least number k > n such that h(k)/h(n) is an integer, where h(n) is the harmonic mean of the divisors of n, or -1 if no such k exists.
A353691
a(n) is the least number k > n such that h(k)/h(n) is an integer, where h(n) is the harmonic mean of the divisors of n, or -1 if no such k exists.
Terms
- a(0) =6a(1) =120a(2) =28a(3) =234a(4) =30a(5) =270a(6) =42a(7) =29792a(8) =252a(9) =1120a(10) =66a(11) =234a(12) =78a(13) =840a(14) =140a(15) =200a(16) =102a(17) =2016a(18) =114a(19) =1170a(20) =945a(21) =1320a(22) =138a(23) =1080a(24) =150a(25) =1560a(26) =756a(27) =270a(28) =174a(29) =3360
External references
- oeis: A353691