A heptagonal number is a figurate number that represents a heptagon. The n-th heptagonal number is given by the formula
- .
The first few heptagonal numbers are:
- 1, 7, 18, 34, 55, 81, 112, 148, 189, 235, 286, 342, 403, 469, 540, 616, 697, 783, 874, 970, 1071, 1177, 1288, 1404, 1525, 1651, 1782, … (sequence A000566 in OEIS)
Read more about Heptagonal Number: Parity, Generalized Heptagonal Numbers, Sum of Reciprocals
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