5516
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 11088
- Proper Divisor Sum (Aliquot Sum)
- 5572
- 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
- 2352
- Möbius Function
- 0
- Radical
- 2758
- Omega Function (Ω)
- 4
- 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
- 129
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
Appears in sequences
- a(n+3) = a(n+2) + a(n+1) + a(n) - 4.at n=15A000803
- Rook polynomials.at n=13A004306
- Number of equilateral triangles formed by triples of points taken from a hexagonal chunk of side n in the hexagonal lattice.at n=7A008893
- Coordination sequence T7 for Zeolite Code VNI.at n=46A009913
- Minimal number of people to give a 50% probability of having at least n coincident birthdays in one year.at n=27A014088
- Twelve iterations of Reverse and Add are needed to reach a palindrome.at n=38A015993
- Denominators of continued fraction convergents to sqrt(198).at n=3A041367
- Coefficient array for certain polynomials N(4; k,x) (rising powers in x).at n=16A062751
- Numbers which need 12 'Reverse and Add' steps to reach a palindrome.at n=38A065217
- Non-balanced numbers in A015765.at n=24A074868
- Triangle T(n, k) read by rows; given by [1, 1, 1, 1, 1, 1, 1, 1, ...] DELTA [1, 0, 2, 0, 2, 0, 3, 0, 2, 0, 4, 0, 2, 0, ...] (A000005 interspersed with 0's) where DELTA is Deléham's operator defined in A084938.at n=30A085853
- a(n) = 7*n^2 + n.at n=28A092277
- Number of (n,3) Freiman-Wyner sequences.at n=11A097925
- Triangle, read by rows, where diagonals are successive self-convolutions of A108447.at n=50A118343
- A diagonal of the triangle A128080 of coefficients of q in the q-analog of the odd double factorials: a(n) = A128080(n+1,n).at n=8A128082
- Number of (directed) Hamiltonian paths in the n-ladder graph.at n=52A137882
- a(n) = 4*n*(4*n^2 + 1).at n=7A144965
- Numbers k such that k^81*(k^81+1)+1 is prime.at n=22A153442
- One half of (n-th sum of primes between successive pairs of twin primes minus n-th number of primes between successive pairs of twin primes).at n=45A168433
- The initial decimal digits of 2^a(n) are the decimal digits of n followed by n.at n=29A171652