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 A383306 #4 Apr 25 2025 10:31:04
%S A383306 0,101,110,112,121,202,211,220,224,242,303,330,336,363,404,422,440,
%T A383306 448,484,505,550,606,633,660,707,770,808,844,880,909,990,1011,1022,
%U A383306 1033,1044,1055,1066,1077,1088,1099,1101,1110,1112,1121,1202,1211,1220,1223,1232
%N A383306 Nonnegative integers whose difference between the largest and smallest digits is equal to the mode of its digits.
%C A383306 It includes only terms with unimodal digits.
%e A383306 363 is a term since 6 - 3 = 3 is equal to the mode of {3, 3, 6}.
%t A383306 Select[Range[0,1400], {Max[d=IntegerDigits[#]]-Min[d]}==Commonest[d] &]
%Y A383306 Cf. A037904, A054054, A054055, A115353, A383307.
%K A383306 nonn,base,easy
%O A383306 1,2
%A A383306 _Stefano Spezia_, Apr 22 2025