2948
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
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 5712
- Proper Divisor Sum (Aliquot Sum)
- 2764
- 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
- 1320
- Möbius Function
- 0
- Radical
- 1474
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- 141
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Smallest k such that the product of q/(q-1) over the primes from prime(n) to prime(n+k-1) is greater than 2.at n=36A001276
- a(n) = Sum_{t=0..n} g(t)*g(n-t) where g(t) = A002121(t).at n=35A002122
- Coordination sequence T2 for Zeolite Code BIK.at n=33A008048
- Coordination sequence T2 for Zeolite Code JBW.at n=36A008122
- Powers of cube root of 20 rounded up.at n=8A018035
- Coordination sequence T3 for Zeolite Code CZP.at n=35A019458
- Fibonacci sequence beginning 4, 18.at n=12A022384
- Ordered sequence of distinct terms of the form floor(exp(i) * floor(exp(j))), i,j >= 0.at n=30A022765
- a(n) = floor(binomial(2*n,n)/3^n).at n=36A024503
- a(n) = A027113(n, 2n-3).at n=7A027121
- Numbers k such that Hofstadter Q-sequence Q(k) (A005185) satisfies Q(k) = k/2.at n=41A027619
- Numbers whose set of base-7 digits is {1,4}.at n=34A032819
- Four times second pentagonal numbers: a(n) = 2*n*(3*n+1).at n=22A033580
- Partial sums of Fibonacci-lucky numbers.at n=48A039677
- Number of partitions satisfying cn(0,5) < cn(1,5) + cn(4,5) + cn(2,5) + cn(3,5).at n=26A039848
- Denominators of continued fraction convergents to sqrt(449).at n=8A041855
- Base-7 palindromes that start with 1.at n=27A043015
- Numbers whose base-7 representation contains exactly four 1's.at n=17A043400
- Numbers n such that string 4,8 occurs in the base 10 representation of n but not of n-1.at n=32A044380
- Numbers n such that string 4,8 occurs in the base 10 representation of n but not of n+1.at n=32A044761