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 A108865 #3 Dec 15 2017 17:36:51 %S A108865 3,9,10,12,25,30,36,49,50,60,70,81,121,126,136,144,150,210,225,289, %T A108865 324,330,338,350,390,462,484,490,510,660,676,690,750,770,780,784,800, %U A108865 841,961,1058,1089,1156,1190,1225,1250,1380,1470,1500,1610,1650,1682,1750 %N A108865 Numbers n such that the perfect deficiency of n (A109883) is prime. %C A108865 Consecutive terms are 9,10 and 49,50. Are there any more? %K A108865 easy,nonn %O A108865 1,1 %A A108865 _Jason Earls_, Jul 12 2005