# 141

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## Number

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

$3 \times 47$

The $30$th lucky number:
$1$, $3$, $7$, $9$, $13$, $15$, $21$, $\ldots$, $105$, $111$, $115$, $127$, $129$, $133$, $135$, $141$, $\ldots$

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 $2$nd Cullen prime after $1$:
$141 \times 2^{141} + 1$

The $27$th positive integer $n$ such that no factorial of an integer can end with $n$ zeroes.