Numbers with exactly 4 2's in their ternary expansion of n.

Terms

a(0) =80a(1) =161a(2) =188a(3) =215a(4) =224a(5) =233a(6) =236a(7) =239a(8) =240a(9) =241a(10) =323a(11) =404a(12) =431a(13) =458a(14) =467a(15) =476a(16) =479a(17) =482a(18) =483a(19) =484a(20) =512a(21) =539a(22) =548a(23) =557a(24) =560a(25) =563a(26) =564a(27) =565a(28) =593a(29) =620