8146
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 12222
- Proper Divisor Sum (Aliquot Sum)
- 4076
- 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
- 4072
- Möbius Function
- 1
- Radical
- 8146
- 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
- 96
- Smith Number
- no
- Vampire 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
Appears in sequences
- Coefficients of Gandhi polynomials.at n=4A005440
- Numbers k such that the continued fraction for sqrt(k) has period 21.at n=40A020360
- a(n) = (d(n)-r(n))/5, where d = A026043 and r is the periodic sequence with fundamental period (0,2,3,0,0).at n=46A026045
- a(n) = Sum_{k=0..n} T(n, k)*T(n, n+k), T given by A027960.at n=8A027984
- Triangle of coefficients of Gandhi polynomials.at n=16A036970
- a(n) = 4*n^2 - 7*n + 4.at n=45A054567
- Integer averages of two successive perfect powers (pp(n) + pp(n+1))/2.at n=23A075454
- Distinct-digit averages of two successive perfect powers (pp(n) + pp(n+1))/2.at n=15A075456
- Another version of triangular array in A036970: triangle T(n,k), 0<=k<=n, read by rows; given by [0, 1, 2, 4, 6, 9, 12, 16, 20, 25, 30, ...] DELTA [1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, ...] where DELTA is the operator defined in A084938.at n=23A094346
- Numerator of (1+1/n)^k - (1+k/n), 2<=k<=n, triangle read by rows.at n=31A099613
- Number of blocks in all RNA secondary structures with n nodes (an RNA secondary structure can be viewed as a restricted noncrossing partition).at n=10A110320
- Semiprimes in A054567.at n=18A113692
- a(n) = floor(n*2*(3^n-2^n)/2^n).at n=13A139754
- G.f. satisfies A(x) = Sum_{n>=0} x^n * (1 - A(x)^(2*n+2))/(1 - A(x)^2).at n=6A199475
- Numbers which are the roots of distinct not-previously-encountered side-trees ("tendrils") sprouting from the side of the infinite beanstalk (see A213730).at n=25A218612
- Numbers that are exactly halfway between the nearest square and the nearest power of 2.at n=6A249875
- Number of (n+1) X (3+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.at n=7A250778
- Number of maximal cliques in the n-triangular honeycomb queen graph.at n=30A289877
- Sum of the prime parts in the partitions of n into 4 parts.at n=43A309465
- Number of integer partitions of n whose Heinz number (product of primes of parts) is divisible by all parts.at n=40A330952