Infinitary harmonic numbers: harmonic mean of infinitary divisors 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) =54600a(18) =81900a(19) =95550a(20) =136500a(21) =163800a(22) =172900a(23) =204750a(24) =232470a(25) =245700a(26) =257040a(27) =409500a(28) =464940a(29) =491400