Bi-unitary arithmetic numbers k whose mean bi-unitary divisor is a bi-unitary divisor of k.

Terms

a(0) =1a(1) =6a(2) =60a(3) =270a(4) =420a(5) =630a(6) =672a(7) =2970a(8) =5460a(9) =8190a(10) =10080a(11) =22848a(12) =30240a(13) =99792a(14) =136500a(15) =172900a(16) =204750a(17) =208656a(18) =245700a(19) =249480a(20) =312480a(21) =332640a(22) =342720a(23) =385560a(24) =491400a(25) =695520a(26) =708288a(27) =791700a(28) =819000a(29) =861840