Tri-unitary harmonic numbers: numbers k such that the harmonic mean of the tri-unitary divisors of k is an integer.

A335387

Tri-unitary harmonic numbers: numbers k such that the harmonic mean of the tri-unitary divisors of k is an integer.

Terms

    a(0) =1a(1) =6a(2) =45a(3) =60a(4) =90a(5) =270a(6) =420a(7) =630a(8) =2970a(9) =5460a(10) =8190a(11) =9100a(12) =15925a(13) =27300a(14) =36720a(15) =40950a(16) =46494a(17) =47520a(18) =54600a(19) =81900a(20) =95550a(21) =136500a(22) =163800a(23) =172900a(24) =204750a(25) =232470a(26) =245700a(27) =257040a(28) =332640a(29) =409500

External references