Doubling (AABBCC)
Make it instantly recognisable
7039 667700
?9,376
?7,501
9152 330011
?9,376
?7,501
9076 001177
?9,376
?7,501
9152 773388
?9,376
?7,501
9769 667755
?9,376
?7,501
9619 223377
?9,376
?7,501
7506 443322
?12,501
?10,001
8879 443322
?12,501
?10,001
7039 111144
?10,626
?8,501
7039 222266
?10,626
?8,501
7039 333388
?10,626
?8,501
8879 222266
?10,626
?8,501
7506-33-00-55
?7,125
?5,700
7506-33-00-66
?7,125
?5,700
7506-11-00-77
?7,125
?5,700
7506-99-00-33
?7,125
?5,700
9769-33-55-33
?7,125
?5,700
9769-11-00-33
?7,125
?5,700
9619-55-00-77
?7,125
?5,700
9167-55-00-99
?7,125
?5,700
9167-99-00-77
?7,125
?5,700
7506-99-00-77
?7,125
?5,700
9966118645
?3,374
?2,699
7799116178
?3,374
?2,699
Doubling (AABBCC) number pattern