11290
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 20340
- Proper Divisor Sum (Aliquot Sum)
- 9050
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 4512
- Möbius Function
- -1
- Radical
- 11290
- 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
- 37
- Smith Number
- no
- Vampire 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
Appears in sequences
- Number of ordered quadruples of integers from [ 1,n ] with no common factors between pairs.at n=39A015636
- a(n) = Sum_{i=0..n} T(i,n-i), array T as in A049735.at n=17A049736
- Consider the sequence b(k) such that b(k) and sigma(b(k)) end with the same digit in base 10. Sequence gives values of b(k) such that b(k)/k = 10.at n=21A065255
- (Sum of composites among next n numbers)-(sum of primes among next n numbers).at n=31A094338
- The sequence d[n] defined in A126940.at n=9A126948
- Describe 10^n. Also called the "Say What You See" or "Look and Say" sequence LS(10^n).at n=29A191111
- Coefficient of x in the reduction of the n-th Fibonacci polynomial by x^3->x^2+2.at n=15A192799
- Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant in {0,1,...,n}.at n=17A209995
- Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 6.at n=35A244460
- Number of overcubic partitions of n.at n=16A246584
- First trisection of A246584.at n=5A246586
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 603", based on the 5-celled von Neumann neighborhood.at n=21A273173
- Number of compositions (ordered partitions) of n into parts with an even number of distinct prime divisors.at n=34A286225
- Partial sums of the ziggurat sequence A347186.at n=36A356351
- Array read by downward antidiagonals: A(n,k) = A(n-1,k+1) + (k+1)*Sum_{j=0..k} A(n-1,j) with A(0,k) = k+1, n >= 0, k >= 0.at n=26A371567
- G.f. A(x) satisfies A(x) = 1 + x/(1+x^3)^2 * A(x)^2.at n=10A390134