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 A153213 #11 Nov 05 2017 11:54:37
%S A153213 2,47,173,277,727,839,929,1181,1423,1447,1523,1627,1811,1847,1861,
%T A153213 1973,2207,2297,2423,2693,3323,3701,3719,3877,4327,4363,4457,4673,
%U A153213 4691,4903,5227,5573,5821,5927,6173,6221,6323,6473,6577,6653,7027,7103,7477,7823
%N A153213 Primes p such that both p-2 and p+2 are not squarefree.
%H A153213 John Cerkan, <a href="/A153213/b153213.txt">Table of n, a(n) for n = 1..10000</a>
%t A153213 lst={};Do[p=Prime[n];If[ !SquareFreeQ[p-2]&&!SquareFreeQ[p+2],AppendTo[lst,p]],{n,7!}];lst
%o A153213 (PARI) is(n)=isprime(n) && !issquarefree(n-2) && !issquarefree(n+2) \\ _Charles R Greathouse IV_, Nov 05 2017
%Y A153213 Cf. A049282, A049097, A039787, A075432, A153207, A153208, A153209, A153210.
%K A153213 nonn
%O A153213 1,1
%A A153213 _Vladimir Joseph Stephan Orlovsky_, Dec 20 2008