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 A086559 #5 Dec 05 2013 19:56:20 %S A086559 0,3,7,489,21,7,3,62991,660121,6,21,4,21,1,17,4502443050081,9,27,9,12, %T A086559 39,3,3,57,8887056427569,17,20039676975717396967,156,23,5,291, %U A086559 240000720001080000810000243,5,33,6,8400000000000000049,3,9,11 %N A086559 a(n) = (smallest n-digit number beginning with n and having prime signature of n)- (smallest n-digit number beginning with n). %F A086559 a(n) = A086558(n) - n*10^(n-d), where d = the number of digits in n. %e A086559 a(4) = 4489 -4000=489. %Y A086559 Cf. A086558. %K A086559 base,nonn %O A086559 1,2 %A A086559 _Amarnath Murthy_, Aug 30 2003 %E A086559 More terms from _Sascha Kurz_, Sep 22 2003