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

This article is issued from ProofWiki. The text is available under Creative Commons Attribution-ShareAlike License unless otherwise noted. Additional terms may apply for the media files.