Composite numbers n such that n'=(n+12)', where n' is the arithmetic derivative of n.

Terms

a(0) =16a(1) =65a(2) =88a(3) =209a(4) =11009a(5) =38009a(6) =680609a(7) =2205209a(8) =2860198a(9) =3515609a(10) =4347209a(11) =5365387a(12) =5809361a(13) =10595009a(14) =12006209a(15) =31979009a(16) =83255059a(17) =89019209a(18) =152915402a(19) =169130009a(20) =172147423a(21) =225869899a(22) =244766009a(23) =247590209a(24) =258084209a(25) =325622009a(26) =357777209a(27) =377330609