![Centered heptagonal number Centered heptagonal number](https://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Centered_heptagonal_number.svg/400px-Centered_heptagonal_number.svg.png)
A centered heptagonal number is a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers. The centered heptagonal number for n is given by the formula
The first few centered heptagonal numbers are
1, 8, 22, 43, 71, 106, 148, 197, 253, 316, 386, 463, 547, 638, 736, 841, 953
A centered heptagonal prime is a centered heptagonal number that is prime. The first few centered heptagonal primes are
The centered heptagonal twin prime numbers are
Owlapps.net - since 2012 - Les chouettes applications du hibou