4548
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 10640
- Proper Divisor Sum (Aliquot Sum)
- 6092
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1512
- Möbius Function
- 0
- Radical
- 2274
- 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
- 20
- 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 T2 for Zeolite Code BIK.at n=41A008048
- Coordination sequence T1 for Zeolite Code RTE.at n=46A009890
- Convolution of A023531 and Lucas numbers.at n=17A023558
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 44.at n=28A031542
- a(n)=(s(n)+3)/9, where s(n)=n-th base 9 palindrome that starts with 6.at n=39A043077
- a(n) = a(n-1) + a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 1.at n=47A050041
- Numbers which are the sum of their proper divisors containing the digit 7.at n=3A059466
- Interprimes which are of the form s*prime, s=12.at n=15A075287
- a(n) = floor((Sum_{r=1..n} r)*(Sum_{r=1..n} 1/r)).at n=44A090541
- Numbers m such that numerator of Sum_{k=1..m} 1/(prime(k)-k) is prime.at n=40A092065
- Number of regions that the line segments in A091908(n) cut the equilateral triangle into.at n=39A092098
- Numbers k with property that k is a peak value in 3x+1 trajectory such that both k+1 and k-1 are prime numbers.at n=25A095385
- Number of triangles in an n X n grid of squares with diagonals.at n=11A100583
- Numbers k such that 4*k-1, 8*k-1 and 16*k-1 are all primes.at n=28A101790
- Numbers k such that k^2-1 and k^2+1 are semiprimes.at n=38A108278
- sigma(n) plus the n-th prime gives a square.at n=33A114082
- Numbers k > 1 for which floor(b(k)) = floor(b(k-1)), where b(m) = Sum_{j=1..m} (j/(j+2)).at n=14A133470
- Number of possible outcomes after n steps of the Zeno gambling process.at n=20A137414
- Numbers k such that both k and k^2/2 are averages of twin prime pairs.at n=12A152787
- a(n) = 216*n + 12.at n=20A154519