7494
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 15000
- Proper Divisor Sum (Aliquot Sum)
- 7506
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 2496
- Möbius Function
- -1
- Radical
- 7494
- Omega Function (Ω)
- 3
- 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
- 88
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- yes
- Odd
- no
Appears in sequences
- Coordination sequence for CaF2(1), Ca position.at n=29A009923
- a(n+2) = 3*a(n) - a(n-2) with a(0) = 1, a(1) = 3, a(2) = 6.at n=14A018186
- Convolution of natural numbers with Beatty sequence for tau^2 A001950.at n=24A023542
- 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 56.at n=40A031554
- Decimal part of a(n)^(1/2) starts with a 'nine digits' anagram.at n=4A034277
- Numbers n such that 173*2^n-1 is prime.at n=24A050838
- Numbers which are the sum of their proper divisors containing the digit 4.at n=9A059463
- Triangle read by rows in which each row is the inverse binomial transform of a diagonal of A089246.at n=41A089302
- Numbers n such that 7*10^n-3 is prime.at n=17A103049
- Members of 3-cycles of permutation A111273.at n=5A113701
- Fixed-j dispersion for Q = 13: array D(g,h) (g, h >= 1), read by ascending antidiagonals.at n=39A120862
- Sequence t_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).at n=11A129875
- Numbers k such that 2^k + 25 is prime.at n=24A157006
- a(n) = ceiling(A029826(n)/2).at n=70A173894
- Expansion of 1/(1 - x - x^10 - x^19 + x^20).at n=54A175740
- a(1)=3, a(2)=1, a(n) = 3*a(n-1) + a(n-2).at n=8A189735
- Triangle of coefficients of polynomials u(n,x) jointly generated with A209163; see the Formula section.at n=40A209162
- Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w^2<=x^2+y^2.at n=23A211806
- Main diagonal starting k=2 of array A(k,n) = numbers n such that n^k - prime(n) is a prime.at n=28A213477
- Trajectory of 80 under the map n-> A006368(n).at n=30A223087