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 A109937 #8 Aug 09 2015 13:10:41 %S A109937 3,3,11,33,11,19,27,17,69,51,25,49,65,57,47,123,5,13,89,49,217,35,139, %T A109937 263,135,207,201,539,345,67,59,69,69,603,91,225,123,191,59,137,227, %U A109937 145,137,83,17,153,73,225,65,207,443,557,347,321,131,595,371,307,159,167 %N A109937 Number of consecutive composite numbers in successive consecutive number sets in A109936; (smallest (n+1)-digit prime) - (largest n-digit prime) - 1. %F A109937 a(n) = A038804(n)-1. - _R. J. Mathar_, Feb 08 2008 %p A109937 A003617 := proc(n) nextprime(10^(n-1)) ; end: A003618 := proc(n) prevprime(10^n) ; end: A038804 := proc(n) A003617(n+1)-A003618(n) ; end: A109937 := proc(n) A038804(n)-1 ; end: seq(A109937(n),n=1..60) ; # _R. J. Mathar_, Feb 08 2008 %Y A109937 Cf. A109936. %K A109937 base,nonn %O A109937 1,1 %A A109937 _Amarnath Murthy_, Jul 19 2005 %E A109937 More terms from _R. J. Mathar_, Feb 08 2008