Numbers with multiplicative digital root value 3.

Terms

a(0) =3a(1) =13a(2) =31a(3) =113a(4) =131a(5) =311a(6) =1113a(7) =1131a(8) =1311a(9) =3111a(10) =11113a(11) =11131a(12) =11311a(13) =13111a(14) =31111a(15) =111113a(16) =111131a(17) =111311a(18) =113111a(19) =131111a(20) =311111a(21) =1111113a(22) =1111131a(23) =1111311a(24) =1113111a(25) =1131111a(26) =1311111a(27) =3111111a(28) =11111113a(29) =11111131