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 A272879 #10 Sep 17 2019 19:40:32 %S A272879 47,89,93,96,105,111,112,120,123,139,143,150,151,155,161,162,168,170, %T A272879 172,176,177,185,186,193,194,195,199,202,203,204,216,223,224,227,234, %U A272879 236,239,240,245,246,247,253,254,260,263,264,266,271,273,274,276,280,289 %N A272879 Numbers n such that A067128(n+1) - A067128(n) is not in A067128. %H A272879 Amiram Eldar, <a href="/A272879/b272879.txt">Table of n, a(n) for n = 1..6740</a> (terms below 10^4) %e A272879 A067128(48) - A067128(47) = 4620-4320=300. But 300 is not in A067128. So 47 is a member. %Y A272879 Cf. A067128. %K A272879 nonn %O A272879 1,1 %A A272879 _Vladimir Shevelev_ and _Peter J. C. Moses_, May 09 2016