3071
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3192
- Proper Divisor Sum (Aliquot Sum)
- 121
- 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
- 2952
- Möbius Function
- 1
- Radical
- 3071
- 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
- 154
- 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
- Number of points of norm <= n in cubic lattice.at n=9A000605
- A nonlinear recurrence.at n=33A003073
- Number of unrooted triangulations of a quadrilateral with n internal nodes.at n=6A005500
- Number of paraffins.at n=23A005999
- Sequence A025513 divided by 2.at n=27A025514
- Number of partitions of n with equal nonzero number of parts congruent to each of 0 and 1 (mod 5).at n=41A035562
- Expansion of (1/(1-x^2))*Product_{m>=0} 1/(1-x^(2m+1)).at n=37A038348
- Coordination sequence T3 for Zeolite Code AWO.at n=38A038405
- Sums of 11 distinct powers of 2.at n=1A038462
- Denominators of continued fraction convergents to sqrt(878).at n=9A042697
- a(n)=(s(n)+5)/9, where s(n)=n-th base 9 palindrome that starts with 4.at n=37A043075
- (s(n)+7)/10, where s(n)=n-th base 10 palindrome that starts with 3.at n=29A043082
- Numbers having three 7's in base 8.at n=5A043451
- Numbers k such that the string 8,2 occurs in the base 9 representation of k but not of k-1.at n=41A044325
- Numbers n such that string 7,1 occurs in the base 10 representation of n but not of n-1.at n=33A044403
- Numbers n such that string 7,1 occurs in the base 10 representation of n but not of n+1.at n=33A044784
- Ratio from A049102.at n=29A049106
- a(n) = a(n-1) + a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 1.at n=40A050041
- a(0) = 1; a(n) = 3*2^n - 1, for n > 0.at n=10A052940
- a(2n) = 2*2^n - 1, a(2n+1) = 3*2^n - 1.at n=21A052955