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 A091646 #13 Jul 21 2015 06:05:04 %S A091646 1,3,29,352,3357,32393,312424,3014171,29016211,279171099,2685272908, %T A091646 25829666453,248507003625,2391688694305 %N A091646 Number of primes less than 10^n having at least one digit 2. %e A091646 a(2) = 3 because of the 25 primes less than 10^2, 3 have at least one digit 2. %Y A091646 a(n) + A091636(n) = A006880(n). %Y A091646 Cf. A091644, A091645, A091647, A091705, A091706, A091707, A091708, A091709, A091710. %K A091646 nonn,base %O A091646 1,2 %A A091646 _Enoch Haga_, Jan 30 2004 %E A091646 Edited and extended by _Robert G. Wilson v_, Feb 02 2004 %E A091646 3 more terms from _Ryan Propper_, Aug 20 2005 %E A091646 a(13) from _Robert Price_, Nov 11 2013 %E A091646 a(14) from _Giovanni Resta_, Jul 21 2015