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 A087434 #10 May 13 2013 01:54:07 %S A087434 10,231,10296,563391,34974066,2374052871,171745762321,12989075028126, %T A087434 1016377282340160,81690831917887753,6708792934060150753, %U A087434 560785267822390134615,47573053155260626453431 %N A087434 Number of brilliant numbers whose prime factors each have n digits. %C A087434 Number of brilliant numbers having 2n or 2n-1 digits. %H A087434 Charles R Greathouse IV, <a href="/A087434/b087434.txt">Table of n, a(n) for n = 1..24</a> %F A087434 a(n)=A000217(A006879(n)). %o A087434 (PARI) a(n)=binomial(primepi(10^n)-primepi(10^(n-1))+1,2) %o A087434 \\ _Charles R Greathouse IV_, May 03 2012 %Y A087434 Cf. A006879, A006880, A078972, A086846, A087435. %K A087434 nonn,base %O A087434 1,1 %A A087434 _Ray Chandler_, Sep 02 2003 %E A087434 a(14) from _Ray Chandler_, Jul 21 2005