Numbers k such that string 2,7 occurs in the base 8 representation of k but not of k-1.

Terms

a(0) =23a(1) =87a(2) =151a(3) =184a(4) =215a(5) =279a(6) =343a(7) =407a(8) =471a(9) =535a(10) =599a(11) =663a(12) =696a(13) =727a(14) =791a(15) =855a(16) =919a(17) =983a(18) =1047a(19) =1111a(20) =1175a(21) =1208a(22) =1239a(23) =1303a(24) =1367a(25) =1431a(26) =1472a(27) =1559a(28) =1623a(29) =1687