221_(number)

221 (number)

221 (number)

Natural number

221 (two hundred [and] twenty-one) is the natural number following 220 and preceding 222.

Quick Facts ← 220 221 222 →, Cardinal ...

In mathematics

Its factorization as 13 × 17 makes 221 the product of two consecutive prime numbers, the sixth smallest such product.[1]

221 is a centered square number.[2]

In other fields

In Texas hold 'em, the probability of being dealt pocket aces (the strongest possible outcome in the initial deal of two cards per player) is 1/221.[3]

Sherlock Holmes's home address: 221B Baker Street.

References

  1. [1]
    Sloane, N. J. A. (ed.). "Sequence A006094 (Products of 2 successive primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. [2]
    Sloane, N. J. A. (ed.). "Sequence A001844 (Centered square numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. [3]
    Bollman, Mark (2014). "Example 2.4.12". Basic Gambling Mathematics: The Numbers Behind The Neon. CRC Press. p. 34. ISBN 9781482208948.
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