1718
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
- 2580
- Proper Divisor Sum (Aliquot Sum)
- 862
- 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
- 858
- Möbius Function
- 1
- Radical
- 1718
- 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
- 148
- 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
- yes
- Odd
- no
Appears in sequences
- Conjecturally largest even integer which is an unordered sum of two primes in exactly n ways.at n=21A000954
- a(n) = n concatenated with n + 1.at n=16A001704
- Numbers that are the sum of 10 positive 6th powers.at n=25A003366
- a(n) is the number of unlabeled modular lattices on n nodes.at n=13A006981
- Coordination sequence T2 for Zeolite Code NON.at n=25A008213
- Coordination sequence T3 for Zeolite Code STI.at n=28A008236
- If a, b in sequence, so is ab+10.at n=15A009368
- Coordination sequence T1 for Zeolite Code RSN.at n=27A009885
- Coordination sequence T3 for Zeolite Code ZON.at n=29A009921
- Fibonacci sequence beginning 2, 30.at n=10A022377
- Sequence and first differences include all positive integers except 2.at n=52A022443
- a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = A000201 (lower Wythoff sequence).at n=18A024685
- a(n) = position of 5 + n^2 in A004432.at n=44A024808
- Number of 3-balanced strings of length n: let d(S)= #(1)'s in S - #(0)'s, then S is k-balanced if every substring T has -k<=d(T)<=k; here k=3.at n=13A027557
- Pair up the numbers.at n=8A030655
- 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 40.at n=9A031538
- Numbers whose set of base-5 digits is {2,3}.at n=45A032805
- Decimal part of a(n)^(1/2) starts with n so that a(n)<a(n+1).at n=44A034067
- Concatenation of two or more consecutive positive integers.at n=24A035333
- Sum of distances between greatest-part-order and length-order of partitions of n.at n=12A036051