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 A056902 #4 Mar 30 2012 18:51:27 %S A056902 0,-1,1,-2,2,-4,-5,6,8,-9,10,-11,-12,12,-13,15,-16,-18,-19,20,-22,22, %T A056902 23,24,-26,26,-27,-29,-30,36,38,40,-41,41,-43,-46,-48,-50,-51,-53,-54, %U A056902 54,-57,58,59,-61,61,66,-68,69,-71,-72,72,73,76,78,-79,-81,-85,85,87 %N A056902 Numbers n where 36n^2+24n+7 is prime (sorted by absolute values with negatives before positives). %C A056902 36m^2+24m+7=(6m+2)^2+3 which is three more than a square %F A056902 36*a(n)^2+24*a(n)+7=A049423(n+1). %e A056902 a(3)=-2 since 36*(-2)^2+24*(-2)+7=144-48+7=103 which is prime %Y A056902 This sequence and formula generate all but the first prime of the form k^2+3, i.e. A049423. %K A056902 sign %O A056902 0,4 %A A056902 _Henry Bottomley_, Jul 06 2000