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A077746

Group the natural numbers such that the n-th group contains p(n-1) numbers, where p(n-1) is the product of the members of (n-1)-th group, starting with the first group which has one term: (1), (2), (3, 4), (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16), (17, 18, ..., 871782912015, 871782912016), ... Sequence contains the sum of the groups.