4076
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 7140
- Proper Divisor Sum (Aliquot Sum)
- 3064
- 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
- 2036
- Möbius Function
- 0
- Radical
- 2038
- 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
- 64
- 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
- Coordination sequence T4 for Zeolite Code MEL.at n=41A008153
- Coordination sequence T4 for Zeolite Code -CHI.at n=40A009849
- Numbers k such that the continued fraction for sqrt(k) has period 52.at n=19A020391
- Trajectory of 1 under map n->25n+1 if n odd, n->n/2 if n even.at n=5A033969
- Numbers k such that k and k-1 both have 6 divisors.at n=41A049104
- Starting positions of strings of 2 0's in the decimal expansion of Pi.at n=27A050201
- Composite n such that phi(n+2) = phi(n)+2.at n=42A056774
- Number of binary arrangements without adjacent 1's on n X n hexagonal staggered torus shifted for odd n.at n=4A067967
- Least numbers m such that GCD of two consecutive values of cototients, i.e., gcd(cototient(m+1), cototient(m)) equals 2n - 1.at n=25A070017
- Numbers n whose sum of divisors and number of divisors are both triangular numbers.at n=17A070996
- Interprimes which are of the form s*prime, s=4.at n=18A075279
- Expansion of (1-x)/(1+x+2*x^3).at n=16A078044
- Numbers k such that A004154(k) - 1 is prime.at n=19A078305
- Indices of terms in the sequence 3, 1, 4, 5, 9, 14, 23, ... (A000285 prefixed with 3) which are prime numbers.at n=35A091158
- a(n) = Sum_{k=1..9} a(n-k); a(8) = 1, a(n) = 0 for n < 8.at n=21A104144
- Least positive k such that k*n + 1 is a golden semiprime (A108540).at n=22A108200
- a(n) = floor(4076/(10-n)^2).at n=8A109552
- The sequence b[n] defined in A126940.at n=8A126946
- a(n) = A129152(n) / 5^5, where A129152 is the trajectory of 5^6 under A003415, the arithmetic derivative.at n=10A129286
- Square array where T(n,k) = Sum_{j=0..k} C(n+2*j,j)*C(n+2*j,k-j), read by antidiagonals.at n=49A137634