3098
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4650
- Proper Divisor Sum (Aliquot Sum)
- 1552
- 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
- 1548
- Möbius Function
- 1
- Radical
- 3098
- 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
- 123
- 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
- Genocchi numbers of second kind (A005439) divided by 2^(n-1).at n=6A000366
- Expansion of 1/(1-2*x^2-3*x^3).at n=14A002447
- If a, b in sequence, so is ab+7.at n=29A009312
- Triangle of numbers associated with Genocchi numbers.at n=21A014784
- Triangle of numbers associated with Genocchi numbers.at n=27A014784
- Numbers k such that the continued fraction for sqrt(k) has period 21.at n=23A020360
- a(n) = floor(Sum_{1<=i<j<=n} (sqrt(j)-sqrt(i))^2).at n=37A025196
- Triangle, T(n, k): T(n,k) = 1 for n < 3, T(3,1) = T(3,2) = T(3,3) = 2, T(n,0) = 1, T(n,1) = n-1, T(n,n) = T(n-1,n-2) + T(n-1,n-1), otherwise T(n,k) = T(n-1,k-2) + T(n-1,k-1) + T(n-1,k), read by rows.at n=77A026268
- a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is a nonnegative integer, s(0) = 0 = s(n), s(1) = 1, |s(i) - s(i-1)| <= 1 for i >= 2, |s(2) - s(1)| = 1, |s(3) - s(2)| = 1 if s(2) = 1. Also a(n) = T(n,n) and a(n) = Sum{T(k,k-1)}, k = 1,2,...,n, where T is array in A026268.at n=9A026269
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 6.at n=11A031419
- Sorted entries in triangle in A014784.at n=11A035003
- Number of partitions of n into parts 5k+1 and 5k+2 with at least one part of each type.at n=51A035631
- Coordination sequence T2 for Zeolite Code STT.at n=37A038423
- Numbers having four 2's in base 6.at n=6A043380
- Numbers having three 2's in base 9.at n=27A043463
- Numbers n such that string 9,8 occurs in the base 10 representation of n but not of n-1.at n=33A044430
- Numbers n such that string 9,8 occurs in the base 10 representation of n but not of n+1.at n=33A044811
- Numbers whose base-5 representation contains exactly two 3's and three 4's.at n=8A045303
- Numbers k such that the k-th partition number A000041(k) is prime.at n=49A046063
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 21.at n=6A051986