208 (number)

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Short description: Natural number
← 207 208 209 →
Cardinaltwo hundred eight
Ordinal208th
(two hundred eighth)
Factorization24 × 13
Greek numeralΣΗ´
Roman numeralCCVIII
Binary110100002
Ternary212013
Quaternary31004
Quinary13135
Senary5446
Octal3208
Duodecimal15412
HexadecimalD016
VigesimalA820
Base 365S36

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, and a member of Aronson's sequence.[5] There are exactly 208 five-bead necklaces drawn from a set of beads with four colors,[6] and 208 generalized weak orders on three labeled points.[7][8]

References

  1. ↑ Sloane, N. J. A., ed. "Sequence A005153 (Practical numbers)". OEIS Foundation. https://oeis.org/A005153. 
  2. ↑ Sloane, N. J. A., ed. "Sequence A000078 (Tetranacci numbers)". OEIS Foundation. https://oeis.org/A000078. 
  3. ↑ Waddill, Marcellus E. (1992), "The Tetranacci sequence and generalizations", The Fibonacci Quarterly 30 (1): 9–20, http://www.fq.math.ca/Scanned/30-1/waddill.pdf .
  4. ↑ Sloane, N. J. A., ed. "Sequence A045944 (Rhombic matchstick numbers)". OEIS Foundation. https://oeis.org/A045944. 
  5. ↑ Sloane, N. J. A., ed. "Sequence A005224 (T is the first, fourth, eleventh, ... letter in this sentence, not counting spaces or commas (Aronson's sequence))". OEIS Foundation. https://oeis.org/A005224. 
  6. ↑ Sloane, N. J. A., ed. "Sequence A001868 (Number of n-bead necklaces with 4 colors)". OEIS Foundation. https://oeis.org/A001868. 
  7. ↑ Sloane, N. J. A., ed. "Sequence A004121 (Generalized weak orders on n points)". OEIS Foundation. https://oeis.org/A004121. 
  8. ↑ Wagner, Carl G. (1982), "Enumeration of generalized weak orders", Archiv der Mathematik 39 (2): 147–152, doi:10.1007/BF01899195 .



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