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 A098565 #36 Oct 30 2022 15:08:59 %S A098565 120,210,1540,7140,11628,24310,61218182743304701891431482520 %N A098565 Numbers that appear as binomial coefficients exactly 6 times. %H A098565 Jean-Marie de Koninck, Nicolas Doyon, and William Verreault, <a href="https://arxiv.org/abs/2107.09107">Repetitions of multinomial coefficients and a generalization of Singmaster's conjecture</a>, arXiv:2107.09107 [math.NT], 2021. %H A098565 Zoe Griffiths, <a href="https://www.youtube.com/watch?v=Z3xq4ODNeZs">My MegaFavNumber: 61,218,182,743,304,701,891,431,482,520</a>, YouTube video, 2020. %H A098565 David Singmaster, <a href="https://doi.org/10.1080/00029890.1971.11992769">How Often Does An Integer Occur As A Binomial Coefficient?</a>, American Mathematical Monthly, 78(4), 1971, pp. 385-386; also on <a href="https://fermatslibrary.com/s/how-often-does-an-integer-occur-as-a-binomial-coefficient">Fermat's Library</a>. %H A098565 Wikipedia, <a href="http://en.wikipedia.org/wiki/Singmaster's_conjecture">Singmaster's conjecture</a> %H A098565 <a href="/index/Pas#Pascal">Index entries for triangles and arrays related to Pascal's triangle</a> %F A098565 A059233(a(n)) = 3. - _Reinhard Zumkeller_, Dec 24 2012 %o A098565 (Haskell) %o A098565 import Data.List (elemIndices) %o A098565 a098565 n = a098565_list !! (n-1) %o A098565 a098565_list = map (+ 2 ) $ elemIndices 3 a059233_list %o A098565 -- _Reinhard Zumkeller_, Dec 24 2012 %Y A098565 See A098564 for more information. %Y A098565 Cf. A185024, A182237. Subsequence of A003015. %Y A098565 Cf. A059233. %K A098565 nonn,more %O A098565 1,1 %A A098565 _Paul D. Hanna_, Oct 27 2004 %E A098565 a(7) from _T. D. Noe_, Jul 13 2005