682

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Number

$682$ (six hundred and eighty-two) is:

$2 \times 11 \times 31$

The $5$th of the $3$-digit integers $m$ which need the largest number of reverse-and-add process iterations ($23$) before reaching a palindromic number:

$682, 968, 1837, \ldots, 8713200023178$

The $8$th positive integer $n$ after $157$, $262$, $367$, $412$, $472$, $487$, $487$ for which $\map \phi {2 n + 1} < \map \phi {2 n}$:

$\map \phi {2 \times 682 + 1} = 576, \map \phi {2 \times 682} = 600$

Also see

• Previous  ... Next: Numbers for which Euler Phi Function of 2n + 1 is less than that of 2n
• Previous  ... Next: 3-Digit Numbers forming Longest Reverse-and-Add Sequence