Heptagonal pyramidal number

Heptagonal pyramidal number

A heptagonal pyramidal number is the sum of the first few heptagonal numbers. The heptagonal number for "n" can be calculated by adding up the heptagonal numbers for 1 to "n", or by using the formula "n"("n" + 1)(5"n" - 2)/6.

The first few heptagonal pyramidal numbers are:

1, 8, 26, 60, 115, 196, 308, 456, 645, 880, 1166, 1508, 1911, 2380, 2920, 3536, 4233, 5016, 5890, 6860, 7931, 9108 OEIS|id=A002413


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