186 (number)
| ||||
|---|---|---|---|---|
| Cardinal | one hundred eighty-six | |||
| Ordinal | 186th (one hundred eighty-sixth) | |||
| Factorization | 2 × 3 × 31 | |||
| Greek numeral | ΡΠϚ´ | |||
| Roman numeral | CLXXXVI | |||
| Binary | 101110102 | |||
| Ternary | 202203 | |||
| Senary | 5106 | |||
| Octal | 2728 | |||
| Duodecimal | 13612 | |||
| Hexadecimal | BA16 | |||
186 (one hundred [and] eighty-six) is the natural number following 185 and preceding 187.
In mathematics[edit]
There is no integer with exactly 186 coprimes less than it, so 186 is a nontotient. It is also never the difference between an integer and the total of coprimes below it, so it is a noncototient.[1]
There are 186 different pentahexes, shapes formed by gluing together five regular hexagons, when rotations of shapes are counted as distinct from each other.[2][3]
186 is a Fine number.[4]
See also[edit]
References[edit]
- ^ Sloane, N. J. A. (ed.). "Sequence A058763 (Integers which are neither totient nor cototient)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A001207 (Number of fixed hexagonal polyominoes with n cells)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Lunnon, W. F. (1972). "Counting hexagonal and triangular polyominoes". In Read, Ronald C. (ed.). Graph Theory and Computing. Academic Press. pp. 87–100. doi:10.1016/B978-1-4832-3187-7.50013-1. ISBN 978-1-4832-3187-7. MR 0337670.
- ^ Sloane, N. J. A. (ed.). "Sequence A000957". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-06-01.
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