5549
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5760
- Proper Divisor Sum (Aliquot Sum)
- 211
- 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
- 5340
- Möbius Function
- 1
- Radical
- 5549
- 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
- 67
- 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
- Number of points on surface of square pyramid: 3*n^2 + 2 (n>0).at n=43A005918
- Coordination sequence T4 for Zeolite Code DOH.at n=46A008081
- Nearest integer to Gamma(n + 5/12)/Gamma(5/12).at n=8A020003
- a(n) = floor(Gamma(n+5/12)/Gamma(5/12)).at n=8A020048
- Numbers k such that the continued fraction for sqrt(k) has period 52.at n=30A020391
- Numbers whose base-5 representation contains exactly two 1's and three 4's.at n=31A045258
- Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 20.at n=16A050969
- (p^2-5)/4 for odd primes p.at n=33A074367
- Values of n such that A006046(n)/n^theta, where theta=log(3)/log(2), is a local minimum, computed according to Harborth's recurrence.at n=12A077465
- Cumulative minima of A006046(n)/n^theta, where theta=log(3)/log(2), is a local minimum.at n=14A084230
- Total number of parts in all partitions of n into prime parts.at n=45A084993
- Convolution of sequence of primes with sequence sigma(n).at n=18A086718
- Sum of the left diagonal in ordered 3 X 3 prime squares.at n=31A105090
- Sum of three consecutive squares: a(n) = n^2 + (n + 1)^2 + (n + 2)^2.at n=43A120328
- Number of 3-overlap triangle-free perfect graphs on n nodes.at n=8A123463
- a(n) = 4*n^2 - 6*n + 1.at n=37A125202
- Row sums of triangle A131819.at n=24A131820
- a(1)=1, a(2)=2. Take terms a(n-1) and a(n-2), then convert to binary. Concatenate them, with either binary a(n-1) on the left and a(n-2) on the right, or with a(n-1) on the right and a(n-2) on the left such that the value of the resulting binary number is minimized. a(n) = the decimal equivalent of the resulting binary number.at n=5A162437
- Magic constants of 5 X 5 magic squares which consist of consecutive primes.at n=21A176571
- A185253(n) is the a(n)-th triangular number.at n=42A185258