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 A038640 #9 Mar 17 2020 06:25:48 %S A038640 49,62,85,134,153,161,177,185,338,388,423,433,434,442,443,473,482,493, %T A038640 523,543,579,657,685,792,801,871,875,949,1001,1014,1124,1148,1151, %U A038640 1205,1280,1309,1337,1416,1432,1488,1499,1549,1615,1688,1757,1796,1799,1838 %N A038640 Numbers k such that k-th and (k+1)-st term of A038593 differ by 9. %H A038640 Jinyuan Wang, <a href="/A038640/b038640.txt">Table of n, a(n) for n = 1..500</a> %Y A038640 Cf. A038657, A038658. %K A038640 nonn %O A038640 1,1 %A A038640 _Jeff Burch_