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 A114564 #5 Jun 23 2014 16:31:12 %S A114564 7,19,31,55,67,139,175,199,211,235,247,307,319,391,415,487,499,535, %T A114564 571,595,631,679,715,787,811,931,1039,1075,1099,1135,1147,1255,1327, %U A114564 1387,1399,1435,1459,1471,1507,1567,1639,1687,1759,1795,1819,1855 %N A114564 Numbers of the form n=12s+7, where q=4s+3 is a prime for which the order of 2 is either q-1 or (q-1)/2. %D A114564 L. Heffter, Über das Problem der Nachbargebiete, Math. Ann., 38 (1891) 477-508. %D A114564 G. Ringel, Map Color Theorem, Springer, 1974, p. 6. %Y A114564 Equals 3*A105876(n) - 2. %K A114564 nonn %O A114564 1,1 %A A114564 _R. K. Guy_, Feb 11 2006