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 A029921 #11 Jul 08 2025 19:25:38 %S A029921 0,2,3,5,6,8,10,11,13,14,16,18,19,21,23,24,26,27,29,31,32,34,35,37,39, %T A029921 40,42,43,45,47,48,50,51,53,55,56,58,60,61,63,64,66,68,69,71,72,74,76, %U A029921 77,79,80,82,84,85,87,89 %N A029921 Convert n from miles to kilometers (km). %D A029921 M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, Tenth Printing, 1972, p. 8. %H A029921 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.convertit.com/Go/ConvertIt/Reference/AMS55.ASP">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy]. %H A029921 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.convertit.com/Go/ConvertIt/Reference/AMS55.ASP">Handbook of Mathematical Functions</a>, National Bureau of Standards Applied Math. Series 55, Tenth Printing, 1972, p. 8. %t A029921 Round[1.609344 Range[0,60]] (* _Harvey P. Dale_, Jul 17 2015 *) %K A029921 nonn %O A029921 0,2 %A A029921 _N. J. A. Sloane_