# 2551

This number is a prime.

The smallest prime *p* such that *p*^{2} + *p* + 4 is a palindrome. [Russo]

2551 = (2*5*5*1)^0 + (2*5*5*1)^1 + (2*5*5*1)^2. [Rooholamini]

The only prime, less than a googol, that is reverse concatenation of n first powers of 5 (n=3). [Loungrides]

Kosmos-2551 was a Russian reconnaissance satellite that did not make it into orbit. [Estremera]

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