1906

Number
$1906$ (one thousand, nine hundred and six) is:


 * $2 \times 953$


 * The $38$th positive integer which cannot be expressed as the sum of a square and a prime:
 * $1, 10, 25, 34, 58, 64, 85, \ldots, 1255, 1351, 1414, 1444, 1521, 1681, 1849, 1906, \ldots$


 * The $17$th non-square positive integer which cannot be expressed as the sum of a square and a prime:
 * $10, 34, 58, 85, 91, 130, 214, 226, 370, 526, 706, 730, 771, 1255, 1351, 1414, 1906, \ldots$