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 A062884 #13 Mar 03 2023 13:48:20
%S A062884 0,1,2,4,8,10,16,20,21,32,40,50,80,100,150,160,210,320,338,400,450,
%T A062884 800,882,1014,1040,1554,1600,4662,5350,8636,10000,13986,16050,25908,
%U A062884 28392,38766,48150,55672,84250,97062,126802,167016,187824,339188,380406,449400,501048
%N A062884 When expressed in base 3 and then interpreted in base 7, is a multiple of the original number.
%e A062884 8 in base 3 is 22, which interpreted in base 7 is 16 = 2*8.
%t A062884 Join[{0},Select[Range[100000],Divisible[FromDigits[IntegerDigits[#,3],7],#]&]] (* _Harvey P. Dale_, Jul 06 2019 *)
%K A062884 base,nonn
%O A062884 1,3
%A A062884 _Erich Friedman_, Jul 21 2001
%E A062884 Offset changed to 1 by _Georg Fischer_, Mar 03 2023
%E A062884 More terms from _Amiram Eldar_, Mar 03 2023