1669
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Number
$1669$ (one thousand, six hundred and sixty-nine) is:
- The $263$rd prime number
- The $8$th after $199$, $409$, $619$, $829$, $1039$, $1249$, $1459$ of the smallest $10$ primes in arithmetic sequence:
- $1669 = 7 \times 210 + 199$
- The larger of the $53$rd pair of twin primes:
- $1669 - 1667 = 2$