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 A036525 #12 Mar 22 2020 17:30:39 %S A036525 28,3828,48828,828828,55888878,3288888856,78888885078,388884828828, %T A036525 13889888887878,28888888883865,8980885988888880,88838888988888990, %U A036525 983888888888812878,8838888986888887878,894885888888885888855,78888888822845888188878,1888886085781088888888878,18788848888888828885888126 %N A036525 Smallest triangular number containing exactly n 8's. %t A036525 nsmall = Table[Infinity, 20]; %t A036525 For[i = 0, i <= 10^6, i++, p = PolygonalNumber[i]; %t A036525 n0 = Count[IntegerDigits[p], 8]; %t A036525 If[nsmall[[n0]] > p, nsmall[[n0]] = p]]; %t A036525 ReplaceAll[nsmall, Infinity -> "?"] (* _Robert Price_, Mar 22 2020 *) %Y A036525 Cf. A048363, A036517-A036526. %K A036525 nonn,base %O A036525 1,1 %A A036525 _David W. Wilson_ %E A036525 a(13)-a(18) from _Giovanni Resta_, Oct 30 2019