401

Previous  ... Next

Number

$401$ (four hundred and one) is:

The $79$th prime number

The smaller of the $4$th pair of primes whose prime gap is $8$:

$409 - 401 = 8$

The $8$th prime number of the form $n^2 + 1$ after $2$, $5$, $17$, $37$, $101$, $197$, $257$:

$401 = 20^2 + 1$

Also see

• Previous  ... Next: Primes of Form n^2 + 1
• Previous  ... Next: Prime Number
• Previous  ... Next: Prime Gaps of 8