15529
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 15876
- Proper Divisor Sum (Aliquot Sum)
- 347
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 15184
- Möbius Function
- 1
- Radical
- 15529
- 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
- 146
- Smith Number
- yes
- 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
- no
- Odd
- yes
Appears in sequences
- Smallest d such that real quadratic field with discriminant d has class number n.at n=23A081364
- Convoluted convolved Fibonacci numbers G_j^(5).at n=11A089092
- Spiro-tetranacci numbers: a(n) = sum of four previous terms that are nearest when terms arranged in a spiral.at n=24A092369
- a(n) = Sum_{i=0..n} i*L(i), where L = A000032.at n=13A097039
- Indices of primes in sequence defined by A(0) = 57, A(n) = 10*A(n-1) - 23 for n > 0.at n=15A101580
- a(n) = n^3 + 71*n + 1.at n=24A124363
- a(n) = 169*n^2 - 140*n + 29.at n=9A156639
- Positive numbers y such that y^2 is of the form x^2+(x+119)^2 with integer x.at n=30A156650
- A156977/3.at n=18A164565
- Constant term in the reduction of the polynomial p(n,x) defined at A162517 and below in Comments.at n=8A192373
- Number of n-bead necklaces labeled with numbers -1..1 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.at n=14A209478
- Sum of positive Dyson's ranks of all partitions of n.at n=29A209616
- Beach-Williams Pell numbers of type pq (p,q primes).at n=13A212078
- Number of (w,x,y,z) with all terms in {0,...,n} and 2w-x=max{w,x,y,z}-min{w,x,y,z}.at n=31A212756
- Volume of right circular cone (rounded down) with the diameter of base and height equal to n.at n=38A228189
- a(0)=0, a(1)=a(2)=a(3)=a(4)=1; thereafter, a(n) = Sum_{k=1..5} a(n-k-(a(n-k) mod 5)).at n=26A259615
- Discriminants of totally real cubic fields in which every norm-positive unit is totally positive.at n=0A329769
- Expansion of Product_{k>=1} (1 + x^(k^2)) * (1 + x^k).at n=49A369570