# 208 (number)

 ← 207 208 209 →
Cardinal two hundred eight
Ordinal 208th
(two hundred and eighth)
Factorization 24× 13
Roman numeral CCVIII
Binary 110100002
Ternary 212013
Quaternary 31004
Quinary 13135
Senary 5446
Octal 3208
Duodecimal 15412
Vigesimal A820
Base 36 5S36

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's A005153 : Practical numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
2. "Sloane's A000078 : 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, MR 1146535.
4. "Sloane's A045944 : Rhombic matchstick numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
5. Wagner, Carl G. (1982), "Enumeration of generalized weak orders", Archiv der Mathematik, 39 (2): 147–152, doi:10.1007/BF01899195, MR 675654.