215 (number)

In mathematics

• 215 is a composite number and a semiprime.
• 215 is the second smallest integer such that is twice a square:.
• There are 215 sequences of four integers, counting re-arrangements as distinct, such that the sum of their reciprocals is 1. These are
• *24 arrangements of,,,, and.
• *12 arrangements of,,, and .
• *6 arrangements of.
• *4 arrangements of.
• *1 arrangement of.

  In other fields

• 215 Oenone is a main belt asteroid.
• E215 is the E number of Sodium ethyl para-hydroxybenzoate.
• There are several highways numbered 215.

• The Dewey Decimal Classification for Science and religion.
• The year AD 215 or 215 BC
• 215 is often used as slang for marijuana, from California Proposition 215, legalizing it for medical use.
• The first area code of metropolitan Philadelphia, Pennsylvania