421

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Number

$421$ (four hundred and twenty-one) is:

The $82$nd prime number

The smaller of the $7$th pair of primes whose prime gap is $10$:

$431 - 421 = 10$

The $15$th of $29$ primes of the form $2 x^2 + 29$:

$2 \times 14^2 + 29 = 421$ (Previous  ... Next)

The larger of the $22$nd pair of twin primes:

$421 - 419 = 2$

Also see

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