Harmonic mean of digits is 4.

Terms

a(0) =4a(1) =36a(2) =44a(3) =63a(4) =288a(5) =346a(6) =364a(7) =436a(8) =444a(9) =463a(10) =634a(11) =643a(12) =828a(13) =882a(14) =2488a(15) =2666a(16) =2848a(17) =2884a(18) =3366a(19) =3446a(20) =3464a(21) =3636a(22) =3644a(23) =3663a(24) =4288a(25) =4346a(26) =4364a(27) =4436a(28) =4444a(29) =4463