186_(number)

186 (number)

186 (number)

Natural number

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

Quick Facts ← 185 186 187 →, Cardinal ...

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. [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. [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. [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. [4]
    Sloane, N. J. A. (ed.). "Sequence A000957". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-06-01.
Wikimedia Commons has media related to 186 (number).
Share this article:

This article uses material from the Wikipedia article 186_(number), and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.