Doubling (AABBCC)
Make it instantly recognisable
993366 9775
?15,625
?12,500
777 99 333 97
?12,501
?10,001
91 9999 7731
?15,625
?12,500
96366 99331
?18,625
?14,900
80 8811 7700
?12,501
?10,001
6292 445566
?26,875
?21,500
6292 556677
?26,875
?21,500
7009 113399
?18,625
?14,900
8017 334455
?26,875
?21,500
8697 336699
?12,501
?10,001
905 111 55 11
?18,625
?14,900
7699 1111 56
?14,376
?11,501
7699 5555 13
?14,376
?11,501
7699 5555 36
?14,376
?11,501
776600 1366
?10,001
?8,001
91 996611 90
?15,625
?12,500
96600 99160
?12,501
?10,001
96366 55771
?18,625
?14,900
95711 99117
?18,625
?14,900
73577 11559
?13,751
?11,001
77799 55173
?13,751
?11,001
9669 966 743
?4,625
?3,700
775500 4666
?7,499
?5,999
73 882233 70
?3,125
?2,500
Doubling (AABBCC) number pattern