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 A133315 #5 May 23 2013 09:43:06 %S A133315 5,8,12,13,17,20,21,24,28,29,32,33,37,41,44,45,48,52,53,56,57,61,68, %T A133315 69,72,73,76,77,80,84,88,89,92,93,97,101,108,109,112,113,116,117,124, %U A133315 125,128,129,132,133,137,141,149,152,153,157,161,164,172,173,176,177,180,181,184,188,189,193,197,201,208 %N A133315 Positive discriminants with form class number 1. %D A133315 D. A. Cox, Primes of the form x^2+ny^2, Wiley, New York, 1989. %D A133315 D. E. Flath, Introduction to Number Theory, Wiley-Interscience, 1989. %o A133315 (PARI) isA133315 (n) = (n % 4 <= 1) && (! issquare(n)) && (qfbclassno(n, 1) == 1) \\ _Michel Marcus_, May 23 2013 %K A133315 nonn %O A133315 1,1 %A A133315 _David Brink_, Dec 30 2007