Numbers k such that 1 and 6 occur juxtaposed in the base-10 representation of k but not of k-1.

Terms

a(0) =16a(1) =61a(2) =116a(3) =160a(4) =216a(5) =261a(6) =316a(7) =361a(8) =416a(9) =461a(10) =516a(11) =561a(12) =610a(13) =661a(14) =716a(15) =761a(16) =816a(17) =861a(18) =916a(19) =961a(20) =1016a(21) =1061a(22) =1116a(23) =1160a(24) =1216a(25) =1261a(26) =1316a(27) =1361a(28) =1416a(29) =1461