Smallest multiple of n with digit sum = 2, or 0 if no such number exists, e.g., a(3k)=0.

Terms

a(0) =2a(1) =2a(2) =0a(3) =20a(4) =20a(5) =0a(6) =1001a(7) =200a(8) =0a(9) =20a(10) =11a(11) =0a(12) =1001a(13) =10010a(14) =0a(15) =2000a(16) =100000001a(17) =0a(18) =1000000001a(19) =20a(20) =0a(21) =110a(22) =100000000001a(23) =0a(24) =200a(25) =10010a(26) =0a(27) =100100a(29) =0a(30) =0