Numbers whose base-7 representation has the same nonzero number of 3's and 5's.

Terms

a(0) =26a(1) =38a(2) =75a(3) =87a(4) =124a(5) =136a(6) =152a(7) =159a(8) =166a(9) =180a(10) =182a(11) =183a(12) =184a(13) =186a(14) =188a(15) =194a(16) =222a(17) =234a(18) =248a(19) =255a(20) =262a(21) =266a(22) =267a(23) =268a(24) =270a(25) =272a(26) =276a(27) =290a(28) =320a(29) =332