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 A178775 #8 May 13 2013 01:49:23 %S A178775 3,2,3,3,2,3,3,2,3,2,2,2,3,3,3,2,3,2,2,3,2,2,3,2,3,2,3,3,2,3,3,2,3,3, %T A178775 2,3,3,3,3,3,3,3,2,3,2,3,3,3,3,2,3,2,2,2,3,2,3,3,2,3,3,2,3,3,2,3,2,2, %U A178775 2,3,2,3,3,3,3,2,3,2,3,3,3,3,3,3,3,2,3,3,2,3,3,2,3,3,2,3,2,3,2,2 %N A178775 Smallest prime factors of zerofull restricted pandigital numbers. %C A178775 a(n) = A020639(A050278(n)); 2 <= a(n) <= 3. %C A178775 a(n) is 2 1653120 times and 3 1612800 times, making the average value 202/81 = 2.493.... [_Charles R Greathouse IV_, Sep 09 2011] %F A178775 a(n) = 2 + A000035(A050278(n)). %e A178775 A050278(1)=1023456789=3*3*3*3*2221*5689 --> a(1)=3; %e A178775 A050278(10)=1023457896=2*2*2*3*3*3*59*80309 --> a(10)=2; %e A178775 A050278(100)=1023495786=2*3*3*739*76943 --> a(100)=2; %e A178775 A050278(1000)=1024658793=3*3*113850977 --> a(1000)=3. %K A178775 fini,nonn,base %O A178775 1,1 %A A178775 _Reinhard Zumkeller_, Jun 11 2010 %E A178775 Edited by _Charles R Greathouse IV_, Aug 02 2010