Position of n-th 6 in A031324.

Terms

a(0) =25a(1) =43a(2) =45a(3) =51a(4) =59a(5) =63a(6) =65a(7) =80a(8) =105a(9) =107a(10) =135a(11) =159a(12) =161a(13) =168a(14) =179a(15) =188a(16) =195a(17) =227a(18) =250a(19) =253a(20) =268a(21) =270a(22) =278a(23) =301a(24) =309a(25) =311a(26) =326a(27) =344a(28) =351a(29) =353