(source : Wikipédia)A star number is a centered figurate number a centered hexagram (six-pointed star), such as the Star of David, or the board Chinese checkers is played on.
The nth star number is given by the formula Sn = 6n(n − 1) + 1. The first 43 star numbers are
1, 13, 37, 73, 121, 181, 253, 337, 433, 541, 661, 793, 937, 1093, 1261, 1441, 1633, 1837, 2053, 2281, 2521, 2773, 3037, 3313, 3601, 3901, 4213, 4537, 4873, 5221, 5581,... plus
