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 A111741 #2 Mar 30 2012 17:26:19 %S A111741 1,2,2,4,2,10,4,2,4,2,2,4,4,2,8,2,10,8,4,2,2,8,4,8,4,2,2,4,2,2,8,2,4, %T A111741 8,20,2,10,4,8,2,2,8,2,4,4,10,2,4,10,2,2,2,10,8,20,4,2,2,10,2,2,10,4, %U A111741 2,2,4,20,4,14,22,4,20,4,2,2,2,10,8,4,10,8,4,2,10,16,2,8,14,4,10,8,16,8,2,2 %N A111741 Distance between k*(n-th prime) and next prime, k=9 case. %C A111741 Other cases: k=1 A001223 Differences between consecutive primes, k=2 A059787, k=3 A114245, k=4 A114246, k=5 A114247, k=6 A114248, k=7 A111739, k=8 A111740, k=10 A111742. %e A111741 a(1)=1 because prime(1)=2 and 9*2+1=19 (prime). %Y A111741 Cf. A001223, A059787, A114245, A114246, A114247, A114248, A111739, A111740, A111742. %K A111741 nonn %O A111741 1,2 %A A111741 _Zak Seidov_, Nov 18 2005