Numbers k such that digital root of k equals largest prime factor of k.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =12a(5) =48a(6) =50a(7) =70a(8) =128a(9) =192a(10) =196a(11) =320a(12) =448a(13) =500a(14) =700a(15) =768a(16) =1960a(17) =2401a(18) =3072a(19) =3200a(20) =4480a(21) =5000a(22) =5488a(23) =7000a(24) =8192a(25) =8575a(26) =12288a(27) =12544a(28) =19600a(29) =20480