This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A366209 #12 Oct 06 2023 11:01:44 %S A366209 3,15,24,33,42,51,60,133,134,135,136,137,138,139,143,153,163,173,183, %T A366209 193,233,234,235,236,237,238,239,243,253,263,273,283,293,303,304,305, %U A366209 306,307,308,309,313,314,315,316,317,318,319,323,324,325,326,327,328,329,330 %N A366209 Numbers whose median of the digits is equal to 3. %e A366209 15 is a term since the median of the digits 1 and 5 is (1+5)/2 = 3; %e A366209 133 is a term since the median of the digits 1, 3, and 3 is 3. %t A366209 Select[Range[0,330], Median[IntegerDigits[#]]==3&] %Y A366209 Cf. A292730 (median = 0), A292739 (median = 9), A366207 (median = 1), A366208 (median = 2), A366210 (median = 4), A366211 (median = 5), A366212 (median = 6), A366213 (median = 7), A366214 (median = 8). %K A366209 nonn,base,easy %O A366209 1,1 %A A366209 _Stefano Spezia_, Oct 04 2023