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Centered Heptagonal Number




:{7n^2 - 7n + 2}\over2.

This can also be calculated by multiplying the Triangular Number for (''n'' - 1) by 7, then adding 1.

The first few centered heptagonal numbers are

1 , 8 , 22 , 43 , 71 , 106 , 148, 197, 253, 316, 386, 463, 547, 638, 736, 841, 953

Centered heptagonal numbers alternate parity in the pattern odd-even-even-odd.


CENTERED HEPTAGONAL PRIME


A centered heptagonal prime is a centered heptagonal number that is Prime . The first few centered heptagonal primes are

43, 71, 197, 463, 547, 953, 1471, 1933, ....

See also regular Heptagonal Number .