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Cunningham n.  and  hexagonal n.

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(max 15 digits)

First numbers that belong to both sets:

15, 28, 120, 325, 17955, 139128, 374545, 20720703, 160554240, 432224101, 23911673955, 185279454480, 498786237505, 27594051024015, 213812329916328, 575598885856165.