1255

Number
$1255$ (one thousand, two hundred and fifty-five) is:
 * $5 \times 251$


 * The $31$st positive integer which cannot be expressed as the sum of a square and a prime:
 * $1, 10, 25, 34, 58, 64, 85, \ldots, 706, 730, 771, 784, 841, 1024, 1089, 1225, 1255, \ldots$