%I #16 Sep 12 2021 13:04:53
%S 20327616,1062880,2125762,3188644,4251526,5314408,6377290,17006110,
%T 18068992,19131874
%N a(n) is the smallest positive integer k such that for all x >= k, at least 50% of the integers in the range 1..x contain n in their decimal expansion. In other words, it is the largest integer k such that exactly half of the integers 1..k have n in their decimal expansion.
%C The sequence is inspired by the fact that, for any string of decimal digits, s, "almost all" integers contain s in their decimal expansion. (The same is true for other bases.)
%e a(1) = 1062880 because exactly half of the integers in [1..1062880] have a 1 in their decimal expansion.
%Y Cf. A343839, A344636, A344474.
%Y Also, this sequence has several values that coincide with values in A117862.
%K nonn,more,base
%O 0,1
%A _John Mason_, Jul 29 2021