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 A171425 #6 Jun 21 2017 22:29:33 %S A171425 8,9,16,18,24,25,36,40,45,48,50,72,75,80,90,100,120,144,150,180,200, %T A171425 225,240,300,360,400,450,600,720,900,1200,1800,3600 %N A171425 Divisors of 60^2 that are not divisors of 60. %C A171425 Set difference A035303 minus A018266; %C A171425 sequence is finite with last term a(33)=3600=60^2; A055205(60)=33. %o A171425 (PARI) setminus(divisors(3600),divisors(60)) \\ _Charles R Greathouse IV_, Jun 21 2017 %K A171425 fini,full,nonn,easy %O A171425 1,1 %A A171425 _Reinhard Zumkeller_, Dec 08 2009