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 A143191 #7 Oct 13 2013 20:21:20 %S A143191 284,1413,2113,3266,4943,6242,9105,11586,6269,6427,8407,8406,9224, %T A143191 11079,12451,8392,3469,4253,4043,4126,4087,4657,4330,4639,5114,3983, %U A143191 5839,4415,6376,4537,5231,5161,4090,3199,2057,3372,2285,2270,2525,2609,2590,1209 %N A143191 a(n) is the smallest natural number we cannot obtain from n, n+1, n+2, n+3, n+4, n+5, n+6 and the operators +, -, *, /, using each number only once. %C A143191 This sequence is related to the sequences A071110 (for 5 successive integers) and A060316 (for 6 successive integers) and others sequences to come... %C A143191 Asymptotically, the sequence tends to 29 (the first n for which a(n)=29 is n=249). %H A143191 Gilles A. Fleury, <a href="/A143191/b143191.txt">Table of n, a(n) for n=0..300</a> %Y A143191 Cf. A071110, A060316, A071107, A060315, A141494, A142153. %K A143191 nonn %O A143191 0,1 %A A143191 _Gilles A.Fleury_, Oct 18 2008