Semiprimes with sum of digits 4.

Terms

a(0) =4a(1) =22a(2) =121a(3) =202a(4) =301a(5) =1003a(6) =1111a(7) =2101a(8) =10003a(9) =10021a(10) =10102a(11) =10201a(12) =11002a(13) =11101a(14) =12001a(15) =30001a(16) =100021a(17) =100102a(18) =100201a(19) =101011a(20) =110002a(21) =110101a(22) =111001a(23) =200011a(24) =200101a(25) =1000021a(26) =1000111a(27) =1000201a(28) =1001002a(29) =1001101