3208
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 6030
- Proper Divisor Sum (Aliquot Sum)
- 2822
- 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
- 1600
- Möbius Function
- 0
- Radical
- 802
- Omega Function (Ω)
- 4
- 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
- 22
- 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
- Coordination sequence T2 for Zeolite Code NAT.at n=38A008204
- Coordination sequence T4 for Zeolite Code CON.at n=40A009871
- Expansion of e.g.f. arctan(arcsin(x) * exp(x)).at n=7A012319
- Numbers k such that phi(k) + 9 | sigma(k + 9).at n=32A015788
- Expansion of 1/((1-x)(1-3x)(1-6x)(1-10x)).at n=3A021514
- a(n) = n*(25*n + 1)/2.at n=16A022283
- 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 13.at n=27A031511
- Number of n-node rooted identity trees of height at most 6.at n=15A038085
- Numbers whose base-7 representation contains exactly three 2's.at n=36A043403
- Numbers n such that string 0,8 occurs in the base 10 representation of n but not of n-1.at n=34A044340
- Numbers n such that string 0,8 occurs in the base 10 representation of n but not of n+1.at n=34A044721
- Numbers k that divide 6^k + 4^k.at n=27A045591
- Let (u1,u2) be successive untouchable numbers such that phi(u1) = phi(u2); sequence gives values of u2.at n=10A048190
- Permutation rooted trees with n nodes.at n=8A050383
- Discriminants of real quadratic number fields K with class number 2 such that the Hilbert class field of K is K(sqrt(2)).at n=49A052476
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 92 ).at n=21A063365
- a(n) = a(n-1)+ceiling(a(n-2)/2) with a(0)=0, a(1)=1.at n=26A064323
- Records for the number of integers k such that k is not of the form m + reverse(m) for any m and for some n A067030(n) occurs in the 'Reverse and Add' trajectory of k (cf. A067284).at n=40A067288
- Stirling-like number triangle defined by sequence A000217.at n=24A080248
- Row sums of A092821.at n=7A092822