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%I A340835 #36 Mar 14 2021 14:26:15
%S A340835 0,1,2,3,4,5,6,7,8,9,11,11,12,12,12,12,12,12,12,12,12,12,13,13,13,13,
%T A340835 13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,
%U A340835 15,15,15,16,16,16,16,16,16,16,16,16,16,17,17,17,17,17,17
%N A340835 a(n) is the least k such that the digit reversal of k is greater than or equal to n.
%C A340835 A004086 gives the digit reversal of a number.
%C A340835 All positive terms belong to A070698.
%C A340835 This sequence is nondecreasing.
%H A340835 Rémy Sigrist, Table of n, a(n) for n = 0..10000
%F A340835 a(n) <= n + 1 with equality iff n = 10^k for some k > 0.
%e A340835 For n = 1000:
%e A340835 - A004086(k) < 1000 for any k <= 1000,
%e A340835 - A004086(1001) = 1001 >= 1000,
%e A340835 - so a(1000) = 1001.
%o A340835 (PARI) { base = 10; k = 0; r = 0; for (n=0, 67, while (r