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iban n.  and  nialpdrome

First numbers that belong to both sets:

1, 2, 3, 4, 7, 10, 11, 20, 21, 22, 40, 41, 42, 43, 44, 70, 71, 72, 73, 74, 77, 100, 110, 111, 200, 210, 211, 220, 221, 222, 300, 310, 311, 320, 321, 322, 400, 410, 411, 420, 421, 422, 440, 441, 442, 443, 444, 700, 710, 711, 720, 721, 722, 740, 741, 742, 743, 744, 770, 771, 772, 773, 774, 777, 1000, 1100, 1110, 1111, 2000, 2100, 2110, 2111, 2200, 2210, 2211, 2220, 2221, 2222, 3000, 3100, 3110, 3111, 3200, 3210, 3211, 3220, 3221, 3222, 3300, 3310, 3311, 3320, 3321, 3322, 4000, 4100, 4110, 4111, 4200, 4210, 4211, 4220, 4221, 4222, 4300, 4310, 4311, 4320, 4321, 4322, 4400, 4410, 4411, 4420, 4421, 4422, 4440, 4441, 4442, 4443, 4444, 7000, 7100, 7110, 7111, 7200, 7210, 7211, 7220, 7221, 7222, 7300, 7310, 7311, 7320, 7321, 7322, 7400, 7410, 7411, 7420, 7421, 7422, 7440, 7441, 7442, 7443, 7444, 7700, 7710, 7711, 7720, 7721, 7722, 7740, 7741, 7742, 7743, 7744, 7770, 7771, 7772, 7773, 7774, 7777, 10000, 11000, 11100, 11110, 11111, 20000, 21000, 21100, 21110, 21111, 22000, 22100, 22110, 22111, 22200, 22210, 22211, 22220, 22221, 22222, 40000, 41000, 41100, 41110, 41111, 42000, 42100, 42110, 42111, 42200, 42210, 42211, 42220, 42221, 42222, 43000, 43100, 43110, 43111, 43200, 43210, 43211, 43220, 43221, 43222, 43300, 43310, 43311, 43320, 43321, 43322, 44000, 44100, 44110, 44111, 44200, 44210, 44211, 44220, 44221, 44222, 44300, 44310, 44311, 44320, 44321, 44322, 44400, 44410, 44411, 44420, 44421, 44422, 44440, 44441, 44442, 44443, 44444, 70000, 71000, 71100, 71110, 71111, 72000, 72100, 72110, 72111, 72200, 72210, 72211, 72220, 72221, 72222, 73000, 73100, 73110, 73111, 73200, 73210, 73211, 73220, 73221, 73222, 73300, 73310, 73311, 73320, 73321, 73322, 74000, 74100, 74110, 74111, 74200, 74210.

Some larger examples :