Numbers n such that string 7,3 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =73a(1) =173a(2) =273a(3) =373a(4) =473a(5) =573a(6) =673a(7) =739a(8) =773a(9) =873a(10) =973a(11) =1073a(12) =1173a(13) =1273a(14) =1373a(15) =1473a(16) =1573a(17) =1673a(18) =1739a(19) =1773a(20) =1873a(21) =1973a(22) =2073a(23) =2173a(24) =2273a(25) =2373a(26) =2473a(27) =2573a(28) =2673a(29) =2739