Numbers n such that string 7,4 occurs in the base 8 representation of n but not of n-1.

Terms

a(0) =60a(1) =124a(2) =188a(3) =252a(4) =316a(5) =380a(6) =444a(7) =480a(8) =508a(9) =572a(10) =636a(11) =700a(12) =764a(13) =828a(14) =892a(15) =956a(16) =992a(17) =1020a(18) =1084a(19) =1148a(20) =1212a(21) =1276a(22) =1340a(23) =1404a(24) =1468a(25) =1504a(26) =1532a(27) =1596a(28) =1660a(29) =1724