Numbers n such that string 8,1 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =81a(1) =181a(2) =281a(3) =381a(4) =481a(5) =581a(6) =681a(7) =781a(8) =819a(9) =881a(10) =981a(11) =1081a(12) =1181a(13) =1281a(14) =1381a(15) =1481a(16) =1581a(17) =1681a(18) =1781a(19) =1819a(20) =1881a(21) =1981a(22) =2081a(23) =2181a(24) =2281a(25) =2381a(26) =2481a(27) =2581a(28) =2681a(29) =2781