16256
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 32640
- Proper Divisor Sum (Aliquot Sum)
- 16384
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 8064
- Möbius Function
- 0
- Radical
- 254
- Omega Function (Ω)
- 8
- 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
- yes
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 53
- 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) = (3*n+1)*(3*n+2).at n=42A001504
- Number of h-cobordism classes of smooth homotopy n-spheres.at n=14A001676
- Number of two-valued complete Post functions of n variables.at n=3A002542
- Coordination sequence for MgZn2, Position Zn1.at n=32A009937
- Coordination sequence for alpha-Mn, Position Mn3.at n=33A009952
- Number of Barlow packings with group P6(bar)m2 that repeat after 2n layers.at n=15A011949
- Expansion of g.f.: 2*x*(1-x)/((1-2*x)*(1-2*x^2)).at n=14A014236
- a(n) = 4^n - 2^n.at n=7A020522
- Numbers n such that uphi(sigma(n)) = n, where the uphi is the unitary phi function A047994.at n=21A030164
- Number of reversible strings with n beads of 2 colors. If more than 1 bead, not palindromic.at n=14A032085
- Product of a prime and the following number.at n=30A036690
- Sums of 4 distinct powers of 5.at n=19A038476
- Sum of every 4th entry of row n in Pascal's triangle, starting at binomial(n,2).at n=16A038505
- Number of elements of GF(2^n) with trace 0 and subtrace 0.at n=16A038518
- Number of 2n-bead balanced binary necklaces which are equivalent to their reversed complement, but not equivalent to their reverse and complement.at n=15A045678
- a(n) is the decimal concatenation of n and n^2.at n=15A053061
- a(n) = A055993(n) - A034444(A056627(n)).at n=34A056630
- Array of values of Jordan function J_k(n) read by antidiagonals (version 1).at n=51A059379
- Array of values of Jordan function J_k(n) read by antidiagonals (version 2).at n=48A059380
- a(n) is the number of distinct patterns (modulo geometric D_3-operations) with no other than strict 120-degree rotational symmetry which can be formed by an equilateral triangular arrangement of closely packed black and white cells satisfying the local matching rule of Pascal's triangle modulo 2, where n is the number of cells in each edge of the arrangement.at n=42A060550