37 (number)

Template:Infobox number 37 (thirty-seven) is the natural number following 36 and preceding 38.

In mathematics

37 is a prime number, a sexy prime, and a Padovan prime 37 is the first irregular prime with irregularity index of 1. 37 is the smallest non-supersingular prime in moonshine theory. 37 is also an emirp because it remains prime when its digits are reversed.

The secretary problem is also known as the 37% rule, since $\frac{1}{e}\approx 37\mathrm{\%}$.

Astronomy

The 37 Cluster

• NGC 2169 is known as the 37 Cluster, due to its resemblance of the numerals.

External links

• 37 Heaven Large collection of facts and links about this number.