[seqfan] A046452

[Harvey P. Dale]

            I believe I am misunderstanding something about the above sequence.  Why aren't these numbers in the sequence: 3729, 28609, 28847, 28951, 29729, 29829?  And why does the definition read, "Concatenation of the 3 prime factors of composite a(n) is a palindrome," rather than "Concatenation of the 3 prime factors of n is a palindrome"?
            Clarification would be appreciated.
            Best,
            Harvey