5078
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
- 7620
- Proper Divisor Sum (Aliquot Sum)
- 2542
- 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
- 2538
- Möbius Function
- 1
- Radical
- 5078
- 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
- 178
- 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
- Coordination sequence T4 for Zeolite Code MTT.at n=44A008192
- a(n) = a(n-1) + a(n-2) + 1, with a(0)=3, a(1)=10.at n=14A022409
- a(n) = [ (3rd elementary symmetric function of S(n))/(first elementary symmetric function of S(n)) ], where S(n) = {first n+2 positive integers congruent to 1 mod 3}.at n=9A024220
- 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 70.at n=13A031568
- Number of partitions of n with equal nonzero number of parts congruent to each of 2, 3 and 4 (mod 5).at n=50A035591
- Denominators of continued fraction convergents to sqrt(388).at n=7A041737
- Numbers whose base-5 representation contains exactly two 0's and three 3's.at n=11A045198
- McKay-Thompson series of class 28a for Monster.at n=27A058610
- Positions of A080299 in A014486.at n=15A080298
- The number of rectangles (orthogonal or not) with corners on an n X n grid of points.at n=10A085582
- Semiprimes that are the sum of the first n semiprimes for some n.at n=18A092190
- Number of squares on infinite half chessboard at <=n knight moves from a fixed point on the edge.at n=27A098498
- Number of compositions of n into 6 parts such that no two adjacent parts are equal.at n=11A106355
- Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1010-1111-1010 pattern in any orientation.at n=10A147443
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (0, 0, 1), (1, -1, 0), (1, 1, 0)}.at n=7A150166
- Conjecturally, even numbers n such that every even number greater than n has more decompositions as the sum of two primes.at n=33A174327
- Constant term of the reduction of n-th polynomial at A157751 by x^2->x+2.at n=8A192338
- a(2)=1, a(3)=2; thereafter a(n) = 2a(n-1)-a(n-2)+A046919(n).at n=9A210726
- Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and -1<=w+2x+3y<=1.at n=36A211623
- Number of (n+1)X(1+1) 0..2 arrays x(i,j) with row sums sum{j^4*x(i,j), j=1..1+1} nondecreasing, and column sums sum{i^4*x(i,j), i=1..n+1} nondecreasing.at n=5A232849