# 653

This number is a prime.

A prime obtained by concatenating in descending order the decimal equivalents of the true minterms in the 3-variable Boolean function F(a,b,c)=abc'+ab'c+a'bc. [Necula]

This prime can be expressed as the sum of squares of five consecutive primes: 5^2 + 7^2 + 11^2 + 13^2 + 17^2. [Patterson]

The first 3-digit prime number to occur in the decimal expansion of π.

The only known prime where 5 is neither a primitive root
nor a quadratic residue of 4n^{2} + 1 [Gudipati]

MGMT 653 is a program designed to integrate years of advanced study by Wharton MBA students, as they apply what they have learned to the problems of organizations in the community. [Roberts]

The digit 6 appears 653 times in the 919 triangular numbers with distinct digits only. [Gaydos]