Numbers n such that n = concatenate(a, b) and sigma(a) + sigma(b) = sigma(n) - n.

Terms

a(0) =39a(1) =119a(2) =253a(3) =581a(4) =1875a(5) =2077a(6) =14477a(7) =15879a(8) =17823a(9) =100637a(10) =160529a(11) =232477a(12) =251189a(13) =286437a(14) =506587a(15) =552739a(16) =605729a(17) =806179a(18) =1170695a(19) =3272257a(20) =3295289a(21) =4085129a(22) =4201441a(23) =4657133a(24) =4844701a(25) =5625173a(26) =8106509a(27) =12430289a(28) =23943721a(29) =33857009