286 (number)
| ||||
|---|---|---|---|---|
| Cardinal | two hundred eighty-six | |||
| Ordinal | 286th (two hundred eighty-sixth) | |||
| Factorization | 2 × 11 × 13 | |||
| Divisors | 1, 2, 11, 13, 22, 26, 143, 286 | |||
| Greek numeral | ΣΠϚ´ | |||
| Roman numeral | CCLXXXVI, cclxxxvi | |||
| Binary | 1000111102 | |||
| Ternary | 1011213 | |||
| Senary | 11546 | |||
| Octal | 4368 | |||
| Duodecimal | 1BA12 | |||
| Hexadecimal | 11E16 | |||
286 is the natural number following 285 and preceding 287.
In mathematics
[edit]- 286 is an even composite number with 3 prime factors.[1]
- 286 is in the smallest pair of nontotient anagrams with 268.[2]
- 286 is a tetrahedral number which means that represents a tetrahedron.[3]
- 286 is a sphenic number which means that it has exactly 3 prime factors.[4]
- 286 the first even pseudoprime to base 3.[5]
References
[edit]- ^ "Composite numbers". mathworld.wolfram.com.
- ^ Sloane, N. J. A. (ed.). "Sequence A039772 (Even numbers k such that phi(k) and k-1 are distinct and have a common factor > 1)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "Tetrahedral numbers". mathworld.wolfram.com.
- ^ "Sphenic numbers". mathworld.wolfram.com.
- ^ Sloane, N. J. A. (ed.). "Sequence A130433 (Even pseudoprimes to base 3)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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