Numbers n such that string 7,9 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =79a(1) =179a(2) =279a(3) =379a(4) =479a(5) =579a(6) =679a(7) =779a(8) =799a(9) =879a(10) =979a(11) =1079a(12) =1179a(13) =1279a(14) =1379a(15) =1479a(16) =1579a(17) =1679a(18) =1779a(19) =1799a(20) =1879a(21) =1979a(22) =2079a(23) =2179a(24) =2279a(25) =2379a(26) =2479a(27) =2579a(28) =2679a(29) =2779