186 (number)

← 185 186 187 →
Cardinalone hundred eighty-six
Ordinal186th
(one hundred eighty-sixth)
Factorization2 × 3 × 31
Greek numeralΡΠϚ´
Roman numeralCLXXXVI
Binary101110102
Ternary202203
Senary5106
Octal2728
Duodecimal13612
HexadecimalBA16

186 (one hundred [and] eighty-six) is the natural number following 185 and preceding 187.

In mathematics

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

References

  1. ^ Sloane, N. J. A. (ed.). "Sequence A058763 (Integers which are neither totient nor cototient)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. ^ Sloane, N. J. A. (ed.). "Sequence A001207 (Number of fixed hexagonal polyominoes with n cells)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. ^ 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.
  4. ^ Sloane, N. J. A. (ed.). "Sequence A000957". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-06-01.
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