199_(number)

199 (number)

199 (number)

Natural number

199 (one hundred [and] ninety-nine) is the natural number following 198 and preceding 200.

Quick Facts ← 198 199 200 →, Cardinal ...

In mathematics

199 is a centered triangular number.[1]

It is a prime number and the fourth part of a prime quadruplet: 191, 193, 197, 199.[2]

199 is the smallest natural number that takes more than two iterations to compute its digital root as a repeated digit sum:

Thus, its additive persistence is three, and it is the smallest number of persistence three.[3]

See also

References

  1. [1]
    Sloane, N. J. A. (ed.). "Sequence A005448 (Centered triangular numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. [2]
    Sloane, N. J. A. (ed.). "Sequence A136162 (List of prime quadruplets)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. [3]
    Sloane, N. J. A. (ed.). "Sequence A006050 (Smallest number of additive persistence n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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