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 A325645 #19 Sep 10 2019 14:16:48 %S A325645 0,1,2,3,9,5,6,7,8,14,10,11,12,13,19,15,16,17,18,24,20,21,22,48,29,25, %T A325645 26,27,28,34,30,31,32,33,39,35,36,37,38,44,40,41,42,43,49,45,46,47,73, %U A325645 54,50,51,52,53,59,55,56,57,58,64,60,61,62,63,69,65,66,67,68,74,70,71 %N A325645 "Sloping quinary numbers": write numbers in quinary under each other (right-justified), read diagonals in upward direction, convert to decimal. %H A325645 Seiichi Manyama, <a href="/A325645/b325645.txt">Table of n, a(n) for n = 0..10000</a> %H A325645 Wikipedia, <a href="https://en.wikipedia.org/wiki/Quinary">Quinary</a> %o A325645 (Ruby) %o A325645 def A(m, n) %o A325645 ary = [0] %o A325645 n.times{|i| %o A325645 (m ** i - i..m ** (i + 1) - i - 2).each{|j| %o A325645 ary << (0..i).inject(0){|s, k| s + (j + k).to_s(m)[-1 - k].to_i * m ** k} %o A325645 } %o A325645 } %o A325645 ary %o A325645 end %o A325645 p A(5, 3) %Y A325645 Cf. A102370 (base 2), A109681 (base3), A325644 (base 4), this sequence (base 5), A325692 (base 6), A325693 (base 7), A325805 (base 8), A325829 (base 9), A103205 (base 10). %K A325645 nonn,base %O A325645 0,3 %A A325645 _Seiichi Manyama_, Sep 07 2019