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215 (number)

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Natural number

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Natural number

215

←210 211 212 213 214 215 216 217 218 219 →

←0 100 200 300 400 500 600 700 800 900 →

two hundred fifteen

215th
(two hundred fifteenth)

5 × 43

ΣΙΕ´

CCXV,ccxv

11010111₂

21222₃

555₆

327₈

15B₁₂

D7₁₆

215 (two hundred [and] fifteen) is thenatural number following214 and preceding216.

In mathematics

215 is acomposite number and asemiprime ( $=5\times 43$ ).
$215=(3!)^{3}-1$ .
215 is the second smallest integer (after 5) such that $n^{2}-17$ is twice a square: $215^{2}-17=2\times 152^{2}$ .^[1]
215 is a vertically symmetric number on a calculator display (sequenceA053701 in theOEIS).

In other fields

215 is often used as slang formarijuana, fromCalifornia Proposition 215, legalizing it formedical use.^{[citation needed]}
MAZ-215 — a fully low-floor articulated Belarusian bus made byMinsk Automobile Plant.

References

^(sequenceA144796 in theOEIS)

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