15076
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 26390
- Proper Divisor Sum (Aliquot Sum)
- 11314
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7536
- Möbius Function
- 0
- Radical
- 7538
- Omega Function (Ω)
- 3
- 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
- 115
- 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(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 4.at n=35A025010
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 70 ones.at n=24A031838
- Multiplicity of highest weight (or singular) vectors associated with character chi_4 of Monster module.at n=50A034392
- Consider the trajectory of n under the iteration of a map which sends x to 3x - sigma(x) if this is >= 0; otherwise the iteration stops. The sequence gives values of n which eventually reach 0.at n=31A037159
- McKay-Thompson series of class 18B for the Monster group.at n=20A058532
- Numbers k for which 10*2^k + 3 is a prime (giving terms of A068712).at n=49A068713
- Square array A(n,k), n>=0, k>=0, read by antidiagonals: A(n,k) is the number of partitions of n^k into powers of k.at n=50A196879
- Number of partitions of n^4 into powers of 4.at n=5A196882
- Number of partitions of 5^n into powers of n.at n=4A196892
- McKay-Thompson series of class 18B for the Monster group with a(0) = 2.at n=20A215407
- McKay-Thompson series of class 18B for the Monster group with a(0) = 5.at n=20A215660
- Number of ways 1/n can be expressed as the sum of four distinct unit fractions: 1/n = 1/w + 1/x + 1/y + 1/z satisfying 0 < w < x < y < z.at n=30A241883
- Expansion of (-1 + Product_{k>=1} 1 / (1 + (-x)^k))^4.at n=26A341243
- a(n) = 3*A364114(n) - 11*A364114(n-1).at n=2A364118