3042
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 9
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 7137
- Proper Divisor Sum (Aliquot Sum)
- 4095
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 936
- Möbius Function
- 0
- Radical
- 78
- Omega Function (Ω)
- 5
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 110
- 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
- a(n) = 2*n^2.at n=39A001105
- Coordination sequence T2 for Zeolite Code EDI.at n=39A008085
- Coordination sequence T6 for Zeolite Code MFS.at n=34A008178
- Theta series of direct sum of 3 copies of hexagonal lattice.at n=12A008654
- Coordination sequence for NiAs(2), As position.at n=26A009945
- a(n) = a(n-1) + a(n-4), starting 1,1,1,3.at n=25A014101
- Bisection of A001400.at n=35A014125
- Numbers k such that k | (phi(k) * sigma(k)) but (phi(k) + sigma(k))/k does not increase.at n=27A015708
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers >= 2), t = (F(2), F(3), F(4), ...).at n=11A024874
- Sequence A025513 divided by 2.at n=8A025514
- T(2n+1, n+1), T given by A026758.at n=6A026876
- a(n) = 3*n^2 - 7*n + 6.at n=33A027599
- Take list of squares, move left digit of each term to end of previous term.at n=49A032760
- a(0)=2; a(n) is the smallest k > a(n-1) such that the fractional part of k^(1/10) starts with n.at n=23A034075
- Coordination sequence for 39-dimensional cubic lattice.at n=2A035734
- Coordination sequence for C_39 lattice.at n=1A035776
- Numerators of continued fraction convergents to sqrt(357).at n=4A041676
- Numbers n such that string 4,2 occurs in the base 10 representation of n but not of n-1.at n=33A044374
- Numbers n such that string 4,2 occurs in the base 10 representation of n but not of n+1.at n=33A044755
- For each prime p take the sum of nonprimes < p.at n=23A045717