Doubling (AABBCC)
Make it instantly recognisable
887711 4000
?13,251
?10,601
993355 1004
?13,251
?10,601
77669933 63
?13,251
?10,601
740 800 8 800
?10,626
?8,501
887711 8282
?10,001
?8,001
887799 0202
?10,001
?8,001
887755 0606
?10,001
?8,001
887755 8282
?10,001
?8,001
887744 3838
?10,001
?8,001
887722 0606
?10,001
?8,001
91 555566 29
?6,625
?5,300
91 555522 89
?4,625
?3,700
91 555566 82
?6,625
?5,300
91 555566 02
?6,625
?5,300
91 555566 32
?6,625
?5,300
91 555566 84
?6,625
?5,300
91 2221 1008
?7,250
?5,800
777 99 666 08
?7,250
?5,800
777 99 666 34
?7,250
?5,800
993399 3004
?10,001
?8,001
995544 3009
?10,001
?8,001
995511 4009
?10,001
?8,001
776699 73 77
?10,001
?8,001
995577 6001
?10,001
?8,001
Doubling (AABBCC) number pattern