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 A207432 #10 Jul 13 2013 12:04:22 %S A207432 1,2,3,4,6,8,9,11,12,14,16,17,18,19,21,23,24,25,27,29,30,32,34,35,36, %T A207432 38,39,41,42,44,46,48,49,50,52,53,55,56,58,60,63,64,66,68,70,71,73,75, %U A207432 76,77,79,80,81,84,85,87,89,90,93,94,95,97,98,99,101,102 %N A207432 Positions of primes in A066680, the badly sieved numbers. %C A207432 A066680(a(n)) = A000040(n). %H A207432 Reinhard Zumkeller, <a href="/A207432/b207432.txt">Table of n, a(n) for n = 1..10000</a> %H A207432 <a href="/index/Si#sieve">Index entries for sequences generated by sieves</a> %o A207432 (Haskell) %o A207432 import Data.List (elemIndex) %o A207432 import Data.Maybe (fromJust) %o A207432 a207432 n = (fromJust $ elemIndex (a000040 n) a066680_list) + 1 %Y A207432 Cf. A000040. %K A207432 nonn %O A207432 1,2 %A A207432 _Reinhard Zumkeller_, Feb 17 2012