171 (number)
| ||||
|---|---|---|---|---|
| Cardinal | one hundred seventy-one | |||
| Ordinal | 171st (one hundred seventy-first) | |||
| Factorization | 32 × 19 | |||
| Divisors | 1, 3, 9, 19, 57, 171 | |||
| Greek numeral | ΡΟΑ´ | |||
| Roman numeral | CLXXI | |||
| Binary | 101010112 | |||
| Ternary | 201003 | |||
| Senary | 4436 | |||
| Octal | 2538 | |||
| Duodecimal | 12312 | |||
| Hexadecimal | AB16 | |||
171 (one hundred [and] seventy-one) is the natural number following 170 and preceding 172.
In mathematics
171 is the 18th triangular number[1] and a Jacobsthal number.[2]
There are 171 transitive relations on three labeled elements,[3] and 171 combinatorially distinct ways of subdividing a cuboid by flat cuts into a mesh of tetrahedra, without adding extra vertices.[4]
The diagonals of a regular decagon meet at 171 points, including both crossings and the vertices of the decagon.[5]
There are 171 faces and edges in the 57-cell, an abstract 4-polytope with hemi-dodecahedral cells that is its own dual polytope.[6]
Within moonshine theory of sporadic groups, the friendly giant is defined as having cyclic groups ⟨ ⟩ that are linked with the function,
- ∈ where is the character of at .
This generates 171 moonshine groups within associated with that are principal moduli for different genus zero congruence groups commensurable with the projective linear group .[7]
See also
- The year AD 171 or 171 BC
- List of highways numbered 171
- All pages with titles containing 171
References
- ^ Sloane, N. J. A. (ed.). "Sequence A000217 (Triangular numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A001045 (Jacobsthal sequence)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A006905 (Number of transitive relations on n labeled nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Pellerin, Jeanne; Verhetsel, Kilian; Remacle, Jean-François (December 2018). "There are 174 subdivisions of the hexahedron into tetrahedra". ACM Transactions on Graphics. 37 (6): 1–9. arXiv:1801.01288. doi:10.1145/3272127.3275037. S2CID 54136193.
- ^ Sloane, N. J. A. (ed.). "Sequence A007569 (Number of nodes in regular n-gon with all diagonals drawn)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ McMullen, Peter; Schulte, Egon (2002). Abstract Regular Polytopes. Encyclopedia of Mathematics and its Applications. Vol. 92. Cambridge: Cambridge University Press. pp. 185–186, 502. doi:10.1017/CBO9780511546686. ISBN 0-521-81496-0. MR 1965665. S2CID 115688843.
- ^ Conway, John; Mckay, John; Sebbar, Abdellah (2004). "On the Discrete Groups of Moonshine" (PDF). Proceedings of the American Mathematical Society. 132 (8): 2233. doi:10.1090/S0002-9939-04-07421-0. eISSN 1088-6826. JSTOR 4097448. S2CID 54828343.