262

Number
$262$ (two hundred and sixty-two) is:


 * $2 \times 131$


 * The $17$th untouchable number after $2, 5, 52, 88, 96, 120, 124, 146, 162, 188, 206, 210, 216, 238, 246, 248$.


 * The $40$th happy number after $1, 7, 10, 13, 19, 23, \ldots, 188, 190, 192, 193, 203, 208, 219, 226, 230, 236, 239$:
 * $262 \to 2^2 + 6^2 + 2^2 = 4 + 36 + 4 = 44 \to 4^2 + 4^2 = 16 + 16 = 32 \to 3^2 + 2^2 = 9 + 4 = 13 \to 1^2 + 3^2 = 9 + 1 = 10 \to 1^2 + 0^2 = 1$


 * The $2$nd positive integer $n$ after $157$ for which $\phi \left({2 n + 1}\right) < \phi \left({2 n}\right)$:
 * $\phi \left({2 \times 262 + 1}\right) = 240, \phi \left({2 \times 262}\right) = 260$