# 7549

This number is a prime.

A prime equal to the concatenation of the four single-digit primes plus their sum: 7532 + (7+5+3+2). [Silva]

The largest known prime such that *p* - *x*^{2} is composite for *x* = 1...sqrt(*p*). [Crespi de Valldaura]

Probably the largest prime not of the form p + k^2, with p prime and k > 0. [Russo]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell