1951

Number
$1951$ (one thousand, nine hundred and fifty-one) is:


 * The $297$th prime number


 * The $2$nd of the $60$th pair of twin primes:
 * $1951 - 1949 = 2$


 * The $26$th centered hexagonal number after $1$, $7$, $19$, $37$, $61$, $91$, $127$, $\ldots$, $817$, $919$, $1027$, $1141$, $1261$, $1387$, $1519$, $1657$, $1801$:
 * $1951= \ds 1 + \sum_{k \mathop = 1}^{26 - 1} 6 k = 26^3 - 25^3$