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 A085370 #4 Feb 16 2025 08:32:50 %S A085370 1,2,4,5,7,8,10,20,40,50,70,80,100,110,112,133,140,152,190,200,209, %T A085370 220,224,230,247,266,280,308,320,322,364,370,392,400,407,410,440,448, %U A085370 460,476,481,500,506,511,512,518,550,592,605,629,640,644,700,704,715 %N A085370 Niven (or Harshad) numbers that are not divisible by 3. %C A085370 a(n) mod A007953(a(n)) = 0 and A007953(a(n)) mod 3 > 0; %C A085370 Intersection of A005349 and A001651. %H A085370 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HarshadNumber.html">Harshad Number</a> %Y A085370 Cf. A085371. %K A085370 nonn,base %O A085370 1,2 %A A085370 _Reinhard Zumkeller_, Jun 26 2003