208 (number)

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← 207 208 209 →
Cardinal two hundred eight
Ordinal 208th
(two hundred eighth)
Factorization 24 × 13
Divisors 1, 2, 4, 8, 13, 16, 26, 52, 104, 208 (10)
Greek numeral ΣΗ´
Roman numeral CCVIII, ccviii
Binary 110100002
Ternary 212013
Senary 5446
Octal 3208
Duodecimal 15412
Hexadecimal D016

208 (two hundred [and] eight) is the natural number following 207 and preceding 209.

208 is a practical number, [1] a tetranacci number, [2] [3] a rhombic matchstick number, [4] a happy number, [5] and a member of Aronson's sequence. [6] There are exactly 208 five-bead necklaces drawn from a set of beads with four colors, [7] and 208 generalized weak orders on three labeled points. [8] [9]

References

  1. ↑ Sloane, N. J. A. (ed.). "SequenceA005153(Practical numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  2. ↑ Sloane, N. J. A. (ed.). "SequenceA000078(Tetranacci numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  3. ↑ Waddill, Marcellus E. (1992), "The Tetranacci sequence and generalizations" (PDF), The Fibonacci Quarterly, 30 (1): 9–20, doi:10.1080/00150517.1992.12429379, MR   1146535 .
  4. ↑ Sloane, N. J. A. (ed.). "SequenceA045944(Rhombic matchstick numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  5. ↑ Sloane, N. J. A. (ed.). "SequenceA007770(happy numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  6. ↑ Sloane, N. J. A. (ed.). "SequenceA005224(T is the first, fourth, eleventh, ... letter in this sentence, not counting spaces or commas (Aronson's sequence))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  7. ↑ Sloane, N. J. A. (ed.). "SequenceA001868(Number of n-bead necklaces with 4 colors)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  8. ↑ Sloane, N. J. A. (ed.). "SequenceA004121(Generalized weak orders on n points)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  9. ↑ Wagner, Carl G. (1982), "Enumeration of generalized weak orders", Archiv der Mathematik, 39 (2): 147–152, doi:10.1007/BF01899195, MR   0675654, S2CID   8263031 .
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