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 A085371 #4 Feb 16 2025 08:32:50 %S A085371 15,33,39,51,57,66,69,75,78,87,93,96,99,105,123,129,138,141,147,159, %T A085371 165,168,174,177,183,186,189,213,219,231,237,246,249,255,258,267,273, %U A085371 276,279,282,291,294,297,303,309,318,321,327,339,345,348,354,357,363 %N A085371 Non-Niven (or non-Harshad) numbers that are divisible by 3. %C A085371 a(n) mod A007953(a(n)) > 0 and A007953(a(n)) mod 3 = 0; %C A085371 Intersection of A065877 and A008585. %H A085371 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HarshadNumber.html">Harshad Number</a> %Y A085371 Cf. A085370, A005349. %K A085371 nonn,base %O A085371 1,1 %A A085371 _Reinhard Zumkeller_, Jun 26 2003