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 A119728 #13 May 25 2020 18:45:36
%S A119728 241,13781,19141,21493,50581,61141,76261,77431,94261,95383,95413,
%T A119728 98101,104743,104869,134581,141653,142453,152629,153991,158341,160933,
%U A119728 165541,169111,199831,201511,203431,206551,229351,233941,235111,253013,273367
%N A119728 Primes p such that p+1, p+2, p+3 and p+4 have equal number of divisors.
%H A119728 Amiram Eldar, <a href="/A119728/b119728.txt">Table of n, a(n) for n = 1..10000</a>
%e A119728 241 is a term since 242, 243, 244 and 245 all have 6 divisors:
%e A119728 {1,2,11,22,121,242},{1,3,9,27,81,243},{1,2,4,61,122,244} and {1,5,7,35,49,245}.
%t A119728 Select[Prime@Range@50000,DivisorSigma[0,#+1]==DivisorSigma[0,#+2]==DivisorSigma[0,#+3]==DivisorSigma[0,#+4]&]
%Y A119728 Cf. A008329, A049234, A119705, A119711, A119730, A119740.
%K A119728 nonn
%O A119728 1,1
%A A119728 _Zak Seidov_, Jul 29 2006