208
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 10
- Divisor Sum
- 434
- Proper Divisor Sum (Aliquot Sum)
- 226
- 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
- 96
- Möbius Function
- 0
- Radical
- 26
- Omega Function (Ω)
- 5
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 13
- Smith 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
Names
- German
- zweihundertacht· ordinal: zweihundertachtste
- English
- two hundred eight· ordinal: two hundred eighth
- Spanish
- doscientos ocho· ordinal: 208º
- French
- deux cent huit· ordinal: deux cent huitième
- Italian
- duecentootto· ordinal: 208º
- Latin
- ducenti octo· ordinal: 208.
- Portuguese
- duzentos e oito· ordinal: 208º
Appears in sequences
- Tetranacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) for n >= 4 with a(0) = a(1) = a(2) = 0 and a(3) = 1.at n=12A000078
- a(n) = floor(n^2/3).at n=25A000212
- Number of steps to reach 1 in sequence A000546.at n=46A000547
- Number of steps to reach 1 in sequence A000546.at n=51A000547
- Numbers that are the sum of 2 squares but not sum of 3 nonzero squares.at n=23A000549
- A Beatty sequence: [ n(e+1) ].at n=55A000572
- Number of nonnegative solutions to x^2 + y^2 + z^2 <= n.at n=43A000606
- Number of monosubstituted alkanes C(n)H(2n+1)-X of the form shown in the Comments lines that are stereoisomers.at n=9A000623
- Number of partitions of n, with three kinds of 1,2 and 3 and two kinds of 4,5,6,....at n=6A000715
- Dimension of the n-th graded piece of the mod-2 Steenrod algebra A_2.at n=57A000929
- Generalized octagonal numbers: k*(3*k-2), k=0, +- 1, +- 2, +-3, ...at n=16A001082
- Number of cells of square lattice of edge 1/n inside quadrant of unit circle centered at 0.at n=16A001182
- Numbers of form m*k with m+1 <= k <= 2m-1.at n=57A001284
- Number of n-bead necklaces with beads of 2 colors and primitive period n, when turning over is allowed.at n=12A001371
- a(n) is the number of partitions of n into at most 3 parts; also partitions of n+3 in which the greatest part is 3; also number of unlabeled multigraphs with 3 nodes and n edges.at n=47A001399
- Number of inverse semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).at n=5A001428
- NPN-equivalence classes of switching functions of exactly n variables.at n=4A001528
- Triangular numbers plus quarter-squares: n*(n+1)/2 + floor((n+1)^2/4) (i.e., A000217(n) + A002620(n+1)).at n=16A001859
- Number of n-bead necklaces with 4 colors.at n=5A001868
- Number of partitions with no even part repeated; partitions of n in which no parts are multiples of 4.at n=18A001935