6228
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 15834
- Proper Divisor Sum (Aliquot Sum)
- 9606
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 2064
- Möbius Function
- 0
- Radical
- 1038
- Omega Function (Ω)
- 5
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 124
- 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
- Number of series-reduced planted trees with n+9 nodes and 4 internal nodes.at n=23A001860
- Number of partitions of n into 6 unordered relatively prime parts.at n=46A023026
- Every run of digits of n in base 3 has length 2.at n=28A033001
- a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 4.at n=28A050055
- Numbers k such that phi(x) = k has exactly 10 solutions.at n=34A060673
- Numbers n such that the area of the parallelogram formed by the vectors (n, prime(n)) and (n+1, prime(n+1)) is an integer square, i.e., Det[{{n, prime(n)},{n+1, prime(n+1)}}] is an integer square.at n=30A067805
- a(n) = n*(2*n^2 -3*n +7)/6 = C(n, 1) + C(n, 2) + 2*C(n, 3).at n=26A081489
- Frequency of the hexadecimal A in the first 10^n hexadecimal digits of Pi.at n=4A099343
- Number of odd parts in all partitions of n into distinct parts.at n=46A116676
- Maximal number of regions obtained by a straight line drawing of the complete bipartite graph K_{n,n}.at n=12A117717
- Matrix inverse of triangle A121336, where A121336(n,k) = C( n*(n+1)/2 + n-k + 2, n-k) for n>=k>=0.at n=50A121441
- Erroneous version of A141347.at n=16A140465
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (0, 0, 1), (1, 0, 1), (1, 1, -1)}.at n=7A150361
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 1), (0, 1, -1), (1, 0, 0), (1, 0, 1)}.at n=7A150393
- Rows sums of triangle A152072.at n=18A152074
- The second of a pair of sequences A and B with property that all the differences |a_i - b_j| are distinct - for precise definition see Comments lines in A169677.at n=38A169678
- Sequence A154692 adjusted to leading one:t(n,m)=A154692(n,m)-A154692(n,0)+1.at n=23A174667
- Sequence A154692 adjusted to leading one:t(n,m)=A154692(n,m)-A154692(n,0)+1.at n=25A174667
- Number of tatami tilings of a 7 X n grid (with monomers allowed).at n=10A192093
- Smallest sum s of two consecutive primes such that s = 0 mod prime(n).at n=39A203836