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199 (one hundred [and] ninety-nine) is the natural number following 198 and preceding 200.
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
- The year AD 199 or 199 BC
- List of highways numbered 199
- All pages with titles containing 199
References
- ^ Sloane, N. J. A. (ed.). "Sequence A005448 (Centered triangular numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A136162 (List of prime quadruplets)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A006050 (Smallest number of additive persistence n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.