Least semiprime whose digital sum is n, or 0 if no such integer exists.

Terms

a(0) =0a(1) =10a(2) =10001a(3) =21a(4) =4a(5) =14a(6) =6a(7) =25a(8) =26a(9) =9a(10) =46a(11) =38a(12) =39a(13) =49a(14) =77a(15) =69a(16) =169a(17) =278a(18) =0a(19) =289a(20) =299a(21) =489a(22) =589a(23) =689a(24) =699a(25) =799a(26) =899a(27) =0a(28) =2899a(29) =3899