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 A053340 #13 Sep 05 2019 10:42:26 %S A053340 5865,8645,10005,10465,13685,15045,15295,16269,18285,20445,22015, %T A053340 24871,26845,27965,28405,28815,29733,30705,31031,31255,33215,35245, %U A053340 36105,37037,37145,37365,37765,37995,38985,39831,40579,41041,43435,44135 %N A053340 Terms of A050530 with four prime divisors. %H A053340 Amiram Eldar, <a href="/A053340/b053340.txt">Table of n, a(n) for n = 1..10000</a> %F A053340 n=pqrs, having 4 prime divisors, squarefree and n-phi(n) is a prime %e A053340 The 3rd entry is 10005=3*5*23*29, also in A050530 and A051953(10005)=5077 is a prime. %Y A053340 Cf. A051953, A050530. %K A053340 nonn %O A053340 1,1 %A A053340 _Labos Elemer_, Jan 05 2000