Numbers k such that string 2,5 occurs in the base 8 representation of k but not of k-1.

Terms

a(0) =21a(1) =85a(2) =149a(3) =168a(4) =213a(5) =277a(6) =341a(7) =405a(8) =469a(9) =533a(10) =597a(11) =661a(12) =680a(13) =725a(14) =789a(15) =853a(16) =917a(17) =981a(18) =1045a(19) =1109a(20) =1173a(21) =1192a(22) =1237a(23) =1301a(24) =1344a(25) =1429a(26) =1493a(27) =1557a(28) =1621a(29) =1685