208 (number)
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]
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
- ↑ "Sloane's A005153 : Practical numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A000078 : Tetranacci numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ Waddill, Marcellus E. (1992), "The Tetranacci sequence and generalizations", The Fibonacci Quarterly 30 (1): 9–20, MR 1146535 .
- ↑ "Sloane's A045944 : Rhombic matchstick numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A005224 : 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.
- ↑ "Sloane's A001868 : Number of n-bead necklaces with 4 colors", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A004121 : Generalized weak orders on n points", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ Wagner, Carl G. (1982), "Enumeration of generalized weak orders", Archiv der Mathematik 39 (2): 147–152, doi:10.1007/BF01899195, MR 675654 .