Numbers whose base-10 representation has the same nonzero number of 3's and 5's.

Terms

a(0) =35a(1) =53a(2) =135a(3) =153a(4) =235a(5) =253a(6) =305a(7) =315a(8) =325a(9) =345a(10) =350a(11) =351a(12) =352a(13) =354a(14) =356a(15) =357a(16) =358a(17) =359a(18) =365a(19) =375a(20) =385a(21) =395a(22) =435a(23) =453a(24) =503a(25) =513a(26) =523a(27) =530a(28) =531a(29) =532