A053340 - OEIS

%I #13 Sep 05 2019 10:42:26

%S 5865,8645,10005,10465,13685,15045,15295,16269,18285,20445,22015,

%T 24871,26845,27965,28405,28815,29733,30705,31031,31255,33215,35245,

%U 36105,37037,37145,37365,37765,37995,38985,39831,40579,41041,43435,44135

%N Terms of A050530 with four prime divisors.

%H Amiram Eldar, <a href="/A053340/b053340.txt">Table of n, a(n) for n = 1..10000</a>

%F n=pqrs, having 4 prime divisors, squarefree and n-phi(n) is a prime

%e The 3rd entry is 10005=3*5*23*29, also in A050530 and A051953(10005)=5077 is a prime.

%Y Cf. A051953, A050530.

%K nonn

%O 1,1

%A _Labos Elemer_, Jan 05 2000