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 A291469 #4 Aug 24 2017 12:55:54
%S A291469 21,18,15,18,21,6,7,8,9,10,11,6,13,7,15,8,17,6,19,10,7,11,21,6,21,13,
%T A291469 9,7,21,6,21,8,11,17,7,6,21,18,13,8,21,6,21,11,9,18,21,6,7,10,15,13,
%U A291469 21,6,11,7,15,18,21,6,21,18,7,8,13,6,21,17,15,7
%N A291469 The arithmetic function u(n,6,4).
%H A291469 Bela Bajnok, <a href="https://arxiv.org/abs/1705.07444">Additive Combinatorics: A Menu of Research Problems</a>, arXiv:1705.07444 [math.NT], May 2017. See Table in Section 1.6.3.
%t A291469 u[n_, m_, h_] := (d = Divisors[n]; Min[(h*Ceiling[m/d] - h + 1)*d]); Table[u[n, 6, 4], {n, 1, 70}]
%Y A291469 Cf. A289435, A289436, A289437, A289438, A289439, A289440, A289441.
%K A291469 nonn
%O A291469 1,1
%A A291469 _Robert Price_, Aug 24 2017