17281
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 18864
- Proper Divisor Sum (Aliquot Sum)
- 1583
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 15700
- Möbius Function
- 1
- Radical
- 17281
- 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
- 172
- 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
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 94 ones.at n=12A031862
- Row 3 of square array defined in A047671.at n=20A047672
- Number of balanced partitions of n: the largest part equals the number of parts.at n=53A047993
- Compositorial numbers (A036691) + 1.at n=5A049650
- a(n) = T(n) concatenated with reverse(T(n)) divided by 11, where T(n) is the n-th triangular number.at n=19A084008
- Sum of first n 6-almost primes.at n=32A086052
- a(n) = prime(n)! / prime(n)# + 1.at n=4A103890
- Numbers k such that 13k = 6j^2 + 6j + 1.at n=29A106390
- Divide primes in groups with 2n+1 elements and add together.at n=11A109725
- Start with 1 and repeatedly reverse the digits and add 36 to get the next term.at n=33A118536
- Poincaré series [or Poincare series] P(C#_{5,2}; x).at n=11A124632
- a(n) = 576*n + 1.at n=29A158370
- a(n) = 30*n^2 + 1.at n=24A158558
- Irregular triangle read by rows: T(n,k) (n >= 2) is the number of cubic graphs on 2n nodes with diameter k.at n=51A204329
- Nonprime numbers with all divisors starting and ending with digit 1.at n=34A208261
- G.f. A(x) satisfies: A(A(A(A(x)))) = G(x) where G(x) = x + 3*x^2 + x*G(G(G(G(x)))) is the g.f. of A215116.at n=5A215117
- Number of partitions of n such that the number of even parts is a part and the number of odd parts is not a part.at n=42A240577
- Semiprimes that are the sum of the first n odd primes for some n.at n=26A274182
- Number of 2 X 2 matrices with all elements in {-n,..,0,..,n} with permanent = determinant * n.at n=32A280407
- Index of first occurrence of n in A280055.at n=6A280760