1673
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1920
- Proper Divisor Sum (Aliquot Sum)
- 247
- 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
- 1428
- Möbius Function
- 1
- Radical
- 1673
- 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
- 91
- 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
- a(n) = ceiling(n*phi^9), where phi is the golden ratio, A001622.at n=22A004964
- Generalized Fibonacci numbers A_{n,3}.at n=27A006208
- Coordination sequence T2 for Zeolite Code MTT.at n=25A008190
- Number of 5-tuples of different integers from [ 2,n ] with no common factors among pairs.at n=24A015699
- Numbers k such that the continued fraction for sqrt(k) has period 26.at n=36A020365
- Fibonacci sequence beginning 1, 11.at n=12A022101
- a(n) = n*(17*n + 1)/2.at n=14A022275
- Numbers k such that Fib(k) == 13 (mod k).at n=13A023178
- Convolution of A023532 and A001950.at n=39A023603
- Numbers with exactly 5 2's in their ternary expansion.at n=27A023703
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = (1, p(1), p(2), ...).at n=38A024369
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = (primes).at n=37A024377
- Duplicate of A024377.at n=37A025069
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023532, t = (primes).at n=36A025077
- Number of partitions of n into distinct parts >= 3.at n=54A025148
- (d(n)-r(n))/5, where d = A008778 and r is the periodic sequence with fundamental period (0,3,1,0,1).at n=33A026053
- a(n) = T(n,n-2), where T is the array in A026386.at n=38A026393
- Numerator of Sum_{p prime, p-1|n} 1/p.at n=51A027759
- Numerator of sum_{p prime, p-1 divides 2*n} 1/p.at n=25A027761
- a(n) = (n + 3)^2 - 8.at n=38A028884