%I
%S 21249,33271,89937,146461,147833,148519,164297,175257,211631,216953,
%T 234269,254849,261023,269941,311229,318033,348823,377001,390447,
%U 520209,561491,848239,941679,943679,957447,960957,1012879,1110159,1221431,1410399,1525203,1681729
%N Numbers with 4 or more prime factors (with multiplicity) such that every concatenation of their prime factors is prime.
%e 21249 is 3*3*3*787. 333787, 337873, 378733 and 787333 are all prime, so 21249 is in the sequence.
%Y Cf. A217263, A217264, A180679, A181559.
%K nonn,base
%O 1,1
%A _Dmitri Kamenetsky_, Sep 29 2012
