409
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Number
$409$ (four hundred and nine) is:
- The $80$th prime number
- The $2$nd after $199$ of the smallest $10$ primes in arithmetic sequence:
- $409 = 1 \times 210 + 199$
- The $10$th minimal prime base $10$ after $2$, $3$, $5$, $7$, $11$, $19$, $41$, $61$, $89$
Also see
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