Concatenation of the 7 prime factors of composite a(n) is a palindrome.

Terms

a(0) =128a(1) =2187a(2) =78125a(3) =496875a(4) =823543a(5) =1908795a(6) =3680733a(7) =6280989a(8) =11447205a(9) =11639595a(10) =14480427a(11) =15839397a(12) =15988245a(13) =17998875a(14) =19165069a(15) =19487171a(16) =22073667a(17) =22444653a(18) =27340845a(19) =30830163a(20) =35277795a(21) =38975433a(22) =44183867