Smallest composite number in base n which contains its largest proper factor as a substring.

Terms

a(0) =4a(1) =9a(2) =407a(3) =25a(4) =9a(5) =49a(6) =893a(7) =1387a(8) =15a(9) =121a(10) =23533a(11) =169a(12) =21a(13) =4717a(14) =10579a(15) =289a(16) =27a(17) =361a(18) =25a(19) =49a(20) =33a(21) =529a(22) =32437a(23) =61903a(24) =39a(25) =24523a(26) =35a(27) =841a(28) =45a(29) =961