Generalized Heptagonal Numbers
A generalized heptagonal number is obtained by the formula
where Tn is the nth triangular number. The first few generalized heptagonal numbers are:
- 1, 4, 7, 13, 18, 27, 34, 46, 55, 70, 81, 99, 112, … (sequence A085787 in OEIS)
Every other generalized heptagonal number is a regular heptagonal number. Besides 1 and 70, no generalized heptagonal numbers are also Pell numbers.
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