5045
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6060
- Proper Divisor Sum (Aliquot Sum)
- 1015
- 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
- 4032
- Möbius Function
- 1
- Radical
- 5045
- 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
- 41
- 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
- no
- Odd
- yes
Appears in sequences
- a(n) = ceiling(1000*log_2(n)).at n=32A004267
- Number of points on surface of square pyramid: 3*n^2 + 2 (n>0).at n=41A005918
- Coordination sequence T3 for Zeolite Code TON.at n=44A008243
- Coordination sequence T4 for Zeolite Code VET.at n=43A009905
- Expansion of 1/((1-4x)(1-6x)(1-7x)(1-8x)).at n=3A028130
- Numerators of continued fraction convergents to sqrt(309).at n=9A041582
- Numerators of continued fraction convergents to sqrt(561).at n=7A042074
- Numbers n such that sigma(n)^2 - phi(n)^2 is a perfect square.at n=20A057654
- Convolution of L(n+1) := A000204(n+1) (Lucas), n>=0, with L(n+3), n>=0.at n=9A067981
- a(n) is twice the least possible area enclosed by a convex lattice n-gon.at n=50A070911
- Numerator of the generalized harmonic number H(n,5,4).at n=4A075143
- Interprimes which are of the form s*prime, s=5.at n=15A075280
- Solve 2^n - 2 = 7(x^2 - x) + (y^2 - y) for (x,y) with x>0, y>0; a(n) = value of y.at n=29A076631
- a(n) = 4*(n+1)*n + 5.at n=35A078370
- Expansion of (5-x^2)/((1+x)*(1-6*x+x^2)).at n=4A098212
- a(n+3) = 2a(n+2) - 3a(n+1) + 2a(n); a(0) = 1, a(1) = -1, a(2) = -2.at n=29A105225
- Sum of three consecutive squares: a(n) = n^2 + (n + 1)^2 + (n + 2)^2.at n=41A120328
- Numbers k such that 2*k+1, 3*k+2 and 4*k+3 are primes.at n=27A126955
- Numbers k such that 3*k+2, 4*k+3 and 5*k+4 are primes.at n=35A126956
- Row sums of A129392.at n=13A129393