# 5

This number is a prime.

Just showing those entries submitted by 'Gupta': (Click here to show all)

5 is the 5th digit in the decimal expansion of π = 3.1415.... [Gupta]

The only prime which is the difference of two prime squares. [Gupta]

The only prime digit in which a perfect square can end. [Gupta]

!5 - 1 is prime. Note that !5 represents subfactorial 5. [Gupta]

The only prime that is sandwiched between two semiprimes. [Gupta]

The floor function of e^phi = 5, where phi is golden ratio. [Gupta]

The largest known number (coincidentally prime) n such that n! is a triangular number. [Gupta]

SOUTH AMERICA is the only continent with all 5 vowels in its name. [Gupta]

5 is the last digit to appear in decimal expansion of Golden ratio. [Gupta]