215 (number)
In-game article clicks load inline without leaving the challenge.
215 (two hundred [and] fifteen) is the natural number following 214 and preceding 216.
In mathematics
- 215 is a composite number and a semiprime (= 5 × 43 {\displaystyle =5\times 43}).
- 215 = ( 3 ! ) 3 − 1 {\displaystyle 215=(3!)^{3}-1}.
- 215 is the second smallest integer (after 5) such that n 2 − 17 {\displaystyle n^{2}-17} is twice a square: 215 2 − 17 = 2 × 152 2 {\displaystyle 215^{2}-17=2\times 152^{2}}.
- 215 is a vertically symmetric number on a calculator display (sequence A053701 in the OEIS).
In other fields
- 215 is often used as slang for marijuana, from California Proposition 215, legalizing it for medical use.[citation needed]
- MAZ-215 — a fully low-floor articulated Belarusian bus made by Minsk Automobile Plant.