a(n) has decimal expansion 3nn3.

Terms

a(0) =3003a(1) =3113a(2) =3223a(3) =3333a(4) =3443a(5) =3553a(6) =3663a(7) =3773a(8) =3883a(9) =3993a(10) =310103a(11) =311113a(12) =312123a(13) =313133a(14) =314143a(15) =315153a(16) =316163a(17) =317173a(18) =318183a(19) =319193a(20) =320203a(21) =321213a(22) =322223a(23) =323233a(24) =324243a(25) =325253a(26) =326263a(27) =327273a(28) =328283a(29) =329293