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 A079170 #28 Oct 31 2023 17:33:52 %S A079170 0,1,2,3,4,5,6,7,8,9,20,41,50,52,71,80,82,111,200,202,203,205,206,208, %T A079170 209,220,222,223,225,226,228,229,230,232,233,235,236,238,239,250,252, %U A079170 411,500,502,711,800,802,1111,2000,2002,2003,2005,2006,2008,2009,2020 %N A079170 a(n) is the next available entirely straight or curved number, depending on whether n contains a curved digit or not. %H A079170 David Consiglio, Jr., <a href="/A079170/b079170.txt">Table of n, a(n) for n = 0..1000</a> %H A079170 David Consiglio, Jr., <a href="/A079170/a079170.py.txt">Python program</a> %e A079170 a(10) must be the first entirely curved number greater than 9, as 0 is curved, therefore a(10)=20. %e A079170 a(17) must be the first entirely straight number greater than 82, therefore a(20)=111. %Y A079170 Cf. A028373 (straight numbers), A028374 (curved numbers), A079064. %K A079170 nonn,base %O A079170 0,3 %A A079170 _Jon Perry_, Feb 03 2003 %E A079170 a(33) and beyond from _David Consiglio, Jr._, Oct 31 2023