141

Number
$141$ (one hundred and forty-one) is:


 * $3 \times 47$


 * The $30$th lucky number:
 * $1, 3, 7, 9, 13, 15, 21, \ldots, 115, 127, 129, 133, 135, 141, \ldots$


 * The $8$th palindromic lucky number:
 * $1, 3, 7, 9, 33, 99, 111, 141, \ldots$


 * The $58$th positive integer after $2, 3, 4, 7, 8, \ldots, 95, 96, 100, 101, 102, 107, 112, 116, 124, 136, 137$ which cannot be expressed as the sum of distinct pentagonal numbers.


 * The index of the $1$st Cullen prime:
 * $141 \times 2^{141} + 1$

Also see