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:
 * $10$, $34$, $58$, $85$, $91$, $130$, $214$, $226$, $370$, $526$, $706$, $730$, $771$, $1255$, $1351$, $1414$, $1906$, $\ldots$