154

Number
$154$ (one hundred and fifty-four) is:


 * $2 \times 7 \times 11$


 * The $21$st nontotient:
 * $\nexists m \in \Z_{>0}: \phi \left({m}\right) = 154$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function


 * The $14$th noncototient after $10, 26, 34, 50, 52, 58, 86, 100, 116, 122, 130, 134, 146$:
 * $\nexists m \in \Z_{>0}: m - \phi \left({m}\right) = 154$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function


 * The $6$th term of Göbel's sequence after $1, 2, 3, 5, 10, 28$:
 * $154 = \left({1 + 1^2 + 2^2 + 3^2 + 5^2 + 10^2 + 28^2}\right) / 6$


 * The $30$th positive integer $n$ such that no factorial of an integer can end with $n$ zeroes.