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iban n.  and  oban n.

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(max 15 digits)

First numbers that belong to both sets:

3, 7, 10, 11, 12, 17, 20, 23, 27, 70, 73, 77, 300, 303, 307, 310, 311, 312, 317, 320, 323, 327, 370, 373, 377, 700, 703, 707, 710, 711, 712, 717, 720, 723, 727, 770, 773, 777.