206 (number)
| ||||
|---|---|---|---|---|
| Cardinal | two hundred six | |||
| Ordinal | 206th (two hundred sixth) | |||
| Factorization | 2 × 103 | |||
| Divisors | 1, 2, 103, 206 | |||
| Greek numeral | ΣϚ´ | |||
| Roman numeral | CCVI | |||
| Binary | 110011102 | |||
| Ternary | 211223 | |||
| Senary | 5426 | |||
| Octal | 3168 | |||
| Duodecimal | 15212 | |||
| Hexadecimal | CE16 | |||
206(two hundred [and] six) is thenatural numberfollowing205and preceding207.
In mathematics
[edit]206 is both anontotientand anoncototient.[1]206 is anuntouchable number.[2]It is the lowest positive integer (when written in English as "two hundred and six" ) to employ all of the vowels once only, not includingY.The other numbers sharing this property are 230, 250, 260, 602, 640, 5000, 8000, 9000, 26,000, 80,000 and 90,000.[3]206 and 207 form the second pair of consecutive numbers (after 14 and 15) whosesums of divisorsare equal.[4]There are exactly 206 differentlinear forestson five labeled nodes,[5]and exactly 206regular semigroupsof order four up to isomorphism and anti-isomorphism.[6]
In science
[edit]There are 206 bones in the typical adult human body.[7]
See also
[edit]- TheYear 206 AD
- Cessna 206,a single engine light aircraft
- Bell 206,a light helicopter
- ThePeugeot 206,a French supermini automobile
- USArea code 206,andThe 206slang terminology for the urban part of the greater Seattle area
- 206 (Ulster) Battery Royal Artillery (Volunteers) "The Ulster Gunners", part of British Army's 105th Regiment Royal Artillery (Volunteers)
- 206 Hersilia,a fairly large Main belt asteroid
- 206 Bones,a novel by Kathy Reichs
References
[edit]- ^Sloane, N. J. A.(ed.)."Sequence A058763 (Integers which are neither totient nor cototient)".TheOn-Line Encyclopedia of Integer Sequences.OEIS Foundation.
- ^"Sloane's A005114: Untouchable numbers".The On-Line Encyclopedia of Integer Sequences.OEIS Foundation. 2016-04-18.Retrieved2016-04-18.
- ^Sloane, N. J. A.(ed.)."Sequence A058180 (Numbers whose English names include all five vowels exactly once)".TheOn-Line Encyclopedia of Integer Sequences.OEIS Foundation.
- ^Sloane, N. J. A.(ed.)."Sequence A002961 (Numbers n such that n and n+1 have same sum of divisors)".TheOn-Line Encyclopedia of Integer Sequences.OEIS Foundation.
- ^Sloane, N. J. A.(ed.)."Sequence A011800 (Number of labeled forests of n nodes each component of which is a path)".TheOn-Line Encyclopedia of Integer Sequences.OEIS Foundation.
- ^Sloane, N. J. A.(ed.)."Sequence A001427 (Number of regular semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator))".TheOn-Line Encyclopedia of Integer Sequences.OEIS Foundation.
- ^O'Sullivan, Robyn (2006),Your 206 Bones, 32 Teeth, And Other Body Math,National Geographic Science Chapters, National Geographic Books,ISBN9780792259558.