158
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 240
- Proper Divisor Sum (Aliquot Sum)
- 82
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 78
- Möbius Function
- 1
- Radical
- 158
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
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
- 36
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- einshundertachtundfünfzig· ordinal: einshundertachtundfünfzigste
- English
- one hundred fifty-eight· ordinal: one hundred fifty-eighth
- Spanish
- ciento cincuenta y ocho· ordinal: 158º
- French
- cent cinquante-huit· ordinal: cent cinquante-huitième
- Italian
- centocinquantotto· ordinal: 158º
- Latin
- centum quinquaginta octo· ordinal: 158.
- Portuguese
- cento e cinquenta e oito· ordinal: 158º
Appears in sequences
- Generalized class numbers c_(n,1).at n=9A000233
- 1 together with products of 2 or more distinct primes.at n=59A000469
- No-3-in-line problem: number of inequivalent ways of placing 2n points on an n X n grid so that no 3 are in a line.at n=10A000769
- Number of symmetrical planar partitions of n (planar partitions (A000219) that when regarded as 3-D objects have just one symmetry plane).at n=16A000784
- Number of inequivalent planar partitions of n, when considering them as 3D objects.at n=11A000786
- Number of switching networks (see Harrison reference for precise definition).at n=1A000830
- Genus of complete graph on n nodes.at n=46A000933
- Image of n under the map n->n/2 if n even, n->3n-1 if n odd.at n=53A001281
- Semiprimes (or biprimes): products of two primes.at n=51A001358
- Partial sums of A001462; also a(n) is the last occurrence of n in A001462.at n=26A001463
- Perrin sequence (or Perrin numbers, or Ondrej Such sequence): a(n) = a(n-2) + a(n-3) with a(0) = 3, a(1) = 0, a(2) = 2.at n=18A001608
- 2 together with primes multiplied by 2.at n=22A001747
- Primes together with primes multiplied by 2.at n=58A001751
- Numbers k such that phi(2k-1) < phi(2k), where phi is Euler's totient function A000010.at n=2A001836
- Total height of trees with n nodes.at n=6A001853
- a(n) = floor((n+1/2)*(2+sqrt(2))); winning positions in the 2-Wythoff game.at n=46A001954
- v-pile positions of the 4-Wythoff game with i=1.at n=30A001964
- Number of symmetric filaments (strip polyominoes) with n square cells.at n=14A002014
- Segmented numbers, or prime numbers of measurement.at n=59A002048
- Numbers k for which the rank of the elliptic curve y^2 = x^3 - k is 0.at n=62A002150