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 A125249 #13 Sep 26 2014 14:57:44
%S A125249 289,201601,222784,638401,868562,910116,4694048,4950625,8994001,
%T A125249 9054081,19855936,30085225,32385152,47623801,55100929,72182016,
%U A125249 78952178,85099058,86303522,91910569,104040000,105678400,111175936,112530002,128504896,133702969,193043236,204404209,216001809,237961476
%N A125249 Numbers n for which the absolute values of the abundances of n, n^2 and n^3 are all prime numbers.
%e A125249 n=289; The abundance of 289 is -271, the abundance of 83521 (289^2) is -78301, the abundance of 24137569 (289^3) is -22628971 - all of which are negatives of primes.
%o A125249 (PARI) {for(n=1,1000000,if(isprime(abs(sigma(n)-2*n))&&isprime(abs(sigma(n^2)-2*n^2))&&isprime(abs(sigma(n^3)-2*n^3)),print1(n,",")))}
%Y A125249 Cf. A088005, A125236, A125237.
%K A125249 nonn
%O A125249 1,1
%A A125249 _Jason G. Wurtzel_, Nov 26 2006
%E A125249 More terms from _Stefan Steinerberger_, May 29 2007
%E A125249 a(21)-a(24) from _Donovan Johnson_, Feb 19 2009
%E A125249 a(25)-a(30) from _Jason G. Wurtzel_, Sep 24 2014