15236
domain: N
Properties
Digital Properties
- Digit Count
- 5
- 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
- 28812
- Proper Divisor Sum (Aliquot Sum)
- 13576
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7008
- Möbius Function
- 0
- Radical
- 7618
- 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
- 177
- 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
- Decimal part of a(n)^(1/4) starts with reversal of its integer part: first term of runs.at n=10A034310
- Denominators of continued fraction convergents to sqrt(127).at n=7A041231
- Number of columns in the character table of the symmetric group S_n that have zero sum.at n=35A085642
- Indices n such that the 3 X 3 matrix with components (row by row) prime(n+k), 0 <= k <= 8, has zero determinant.at n=21A117345
- Expansion of x/(1 - 22*x^2 - 54*x^3 - 38*x^4).at n=7A122502
- a(n) = Farey(m; I) where m = Fibonacci(n + 1) and I = [1/n, 1].at n=11A176501
- Expansion of 2/((x+3)*sqrt(-3*x^2-2*x+1)+3*x^2+2*x-1).at n=11A189832
- Number of n X 4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,3,4 for x=0,1,2,3,4.at n=9A196134
- E.g.f. satisfies: A(x) = exp(x*A(2*x)^(1/2)).at n=5A196734
- The permanent of the distance matrix of the rooted tree having Matula number n.at n=17A206489
- The permanent of the distance matrix of the rooted tree having Matula number n.at n=22A206489
- The permanent of the distance matrix of the rooted tree having Matula number n.at n=25A206489
- The permanent of the distance matrix of the rooted tree having Matula number n.at n=40A206489
- a(n) = n*prime(prime(n)) - prime(n)^2.at n=44A230098
- Number of length n+3 0..3 arrays with no pair in any consecutive four terms totalling exactly 3.at n=7A246474
- Numbers n such that 2*n*3^n + 1 is prime.at n=29A266694
- a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(n*j*k) / phi(n*k).at n=32A372669
- Triangle read by rows: T(n,k) = number of connected cubic graphs on 2n vertices with crossing number k for n >= 2, k >= 0.at n=22A390643