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 A072685 #1 May 16 2003 03:00:00 %S A072685 1,2,3,6,7,8,10,15,16,23,27,28,33,37,38,40,50,60,70,74,75,79,83,87,88, %T A072685 93,97,98,104,105,109,111,112,120,124,125,129,130,134,135,139,143,147, %U A072685 148,153,157,158,163,167,168,171,172,176,180,184,185,189,190,194,195 %N A072685 Positive integers whose English names contain a prime number of letters. %e A072685 First value is 1 because 1 -> "ONE" -> 3 letters and 3 is prime. Numbers >100 use naming convention using "and": 199 -> "ONEHUNDREDANDNINETYNINE" -> 23 letters and 23 is prime. %K A072685 easy,nonn,word %O A072685 1,2 %A A072685 Mark Hudson (mrmarkhudson(AT)hotmail.com), Jul 02 2002