677

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Number

$677$ (six hundred and seventy-seven) is:

The $123$rd prime number

The $10$th prime number of the form $n^2 + 1$ after $2$, $5$, $17$, $37$, $101$, $197$, $257$, $401$, $577$:

$677 = 26^2 + 1$

The $19$th of $29$ primes of the form $2 x^2 + 29$:

$2 \times 18^2 + 29 = 677$ (Previous  ... Next)

The $29$th near-repdigit prime after $101$, $113$, $131$, $151$, $\ldots$, $353$, $373$, $383$, $433$, $443$, $449$, $499$, $557$, $577$, $599$, $661$

Also see

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