318
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 648
- Proper Divisor Sum (Aliquot Sum)
- 330
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 104
- Möbius Function
- -1
- Radical
- 318
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 55
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Names
- German
- dreihundertachtzehn· ordinal: dreihundertachtzehnste
- English
- three hundred eighteen· ordinal: three hundred eighteenth
- Spanish
- trescientos dieciocho· ordinal: 318º
- French
- trois cent dix-huit· ordinal: trois cent dix-huitième
- Italian
- trecentodiciotto· ordinal: 318º
- Latin
- trecenti duodeviginti· ordinal: 318.
- Portuguese
- trezentos e dezoito· ordinal: 318º
Appears in sequences
- Number of partially ordered sets ("posets") with n unlabeled elements.at n=6A000112
- Number of combinatorial types of simplicial n-dimensional polytopes with n+3 nodes.at n=9A000943
- Number of ways of making change for n cents using coins of 1, 2, 5, 10, 25 cents.at n=46A001301
- Number of ways of making change for n cents using coins of 1, 2, 5, 10, 25, 50 cents.at n=46A001302
- Expansion of (1+x^3)/((1-x)*(1-x^2)^2*(1-x^3)).at n=20A001973
- Number of integral points in a certain sequence of open quadrilaterals.at n=28A002578
- Number of 3-edge-colored connected trivalent graphs with 2n nodes.at n=4A002831
- High-temperature series in v = tanh(J/kT) for susceptibility for the Ising model on honeycomb structure.at n=8A002910
- High-temperature series for susceptibility for the spin-1/2 Ising model on hexagonal lattice.at n=4A002919
- Problimes (first definition).at n=56A003066
- a(n) = A000201(A003234(n)) + n.at n=46A003248
- Expansion of (1+x)(1+x^2)/(1-x-x^3).at n=14A003410
- Expansion of 1/((1-2x)(1+x^2)(1-x-2x^3)).at n=7A003477
- a(n) is smallest number which is uniquely of the form a(j) + a(k) with 1 <= j < k < n and a(1) = 1, a(2) = 4.at n=58A003666
- a(n) is smallest number which is uniquely of the form a(j) + a(k) with 1 <= j < k < n and a(1) = 1, a(2) = 5.at n=59A003667
- a(n) = 100*log(n) rounded to nearest integer.at n=23A004238
- a(n) = ceiling(100*log(n)).at n=23A004239
- Barriers for omega(n): numbers n such that, for all m < n, m + omega(m) <= n.at n=53A005236
- Nontotients: even numbers k such that phi(m) = k has no solution.at n=53A005277
- Number of unrooted triangulations with reflection symmetry of a disk with 2 internal nodes and n+3 nodes on the boundary.at n=8A005509