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 A049080 #20 Mar 27 2015 23:21:29 %S A049080 11,277,1063,2221,3001,4397,7193,9319,10631,12763,15823,21179,22093, %T A049080 24859,30133,33967,37217,38833,40819,43651,55351,57943,60647,66851, %U A049080 68639,77431,80071,84347,90023,98519,101701,103069,125113,127643 %N A049080 Primes prime(k) for which A049076(k) = 4. %H A049080 Jens Kruse Andersen, <a href="/A049080/b049080.txt">Table of n, a(n) for n = 1..10000</a> %H A049080 N. Fernandez, <a href="http://www.borve.org/primeness/FOP.html">An order of primeness, F(p)</a> %H A049080 N. Fernandez, <a href="/A006450/a006450.html">An order of primeness</a> [cached copy, included with permission of the author] %p A049080 A049080 := proc(n) %p A049080 ithprime(A049079(n)) ; %p A049080 end proc: # _R. J. Mathar_, Jul 07 2012 %t A049080 Nest[ Prime, Select[ Range[50], !PrimeQ[ # ] &], 4] (* _Robert G. Wilson v_, Mar 15 2004 *) %Y A049080 Cf. A049076, A007821, A049078, A049079, A049081, A058322, A058324, A058325, A058326, A058327, A058328, A093046, A006450. %K A049080 nonn %O A049080 1,1 %A A049080 _Neil Fernandez_