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 A142342 #11 Feb 03 2024 00:51:25 %S A142342 20,30,50,70,110,130,170,190,230,290,310,370,410,430,470,530,590,610, %T A142342 670,710,730,790,830,890,970,1010,1030,1070,1090,1130,1270,1310,1370, %U A142342 1390,1490,1510,1570,1630,1670,1730,1790,1810,1910,1930,1970,1990,2110,2230,2270 %N A142342 a(n) = 10*prime(n). %t A142342 10*Prime[Range[60]] (* _Harvey P. Dale_, May 26 2014 *) %K A142342 nonn %O A142342 1,1 %A A142342 _N. J. A. Sloane_, Nov 09 2008