Composite numbers k such that all prime factors of k are a substring of k.

Terms

a(0) =25a(1) =32a(2) =125a(3) =128a(4) =135a(5) =175a(6) =243a(7) =250a(8) =256a(9) =324a(10) =375a(11) =432a(12) =512a(13) =625a(14) =735a(15) =875a(16) =1024a(17) =1250a(18) =1352a(19) =1372a(20) =1593a(21) =1675a(22) =1715a(23) =1792a(24) =2048a(25) =2176a(26) =2304a(27) =2500a(28) =2510a(29) =2560