Numbers n such that string 4,1 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =41a(1) =141a(2) =241a(3) =341a(4) =419a(5) =441a(6) =541a(7) =641a(8) =741a(9) =841a(10) =941a(11) =1041a(12) =1141a(13) =1241a(14) =1341a(15) =1419a(16) =1441a(17) =1541a(18) =1641a(19) =1741a(20) =1841a(21) =1941a(22) =2041a(23) =2141a(24) =2241a(25) =2341a(26) =2419a(27) =2441a(28) =2541a(29) =2641