313 (number)
# 313 (number)

313 (three hundred [and] thirteen) is the natural number following 312 and preceding 314.

Additionally, 313 is:

* a prime number
* a twin prime with 311
* a centered square number
* a full reptend prime (and the smallest number which is a full reptend prime in base 10 but not in base 2 to 9)
* a Pythagorean prime
* a regular prime
* a palindromic prime in both decimal and binary.
* a truncatable prime
* a weakly prime in base 5
* a happy number
* an Armstrong number - in base 4 ( $3×4^2$ + $1×4^1$ + $3×4^0$ = $3^3$ + $1^3$ + $3^3$ )
* an index of a prime Lucas number.
