4286
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
- 5
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6432
- Proper Divisor Sum (Aliquot Sum)
- 2146
- 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
- 2142
- Möbius Function
- 1
- Radical
- 4286
- 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
- 170
- 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 T2 for Zeolite Code MEL.at n=42A008151
- Coordination sequence T5 for Zeolite Code RSN.at n=42A009889
- Inverse Euler transform of {A001285(0), A001285(1), ...} where A001285(n) is Thue-Morse sequence.at n=49A029878
- Cube root of A030683.at n=16A030684
- 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 64.at n=14A031562
- Numbers with exactly five distinct base-8 digits.at n=19A031985
- Numbers n such that [A070080(n), A070081(n), A070082(n)] is an integer triangle with integer area, having relatively prime side lengths.at n=31A070143
- Numbers n such that [A070080(n), A070081(n), A070082(n)] is a scalene integer triangle with integer area.at n=33A070144
- Numbers k such that [A070080(k), A070081(k), A070082(k)] is an obtuse integer triangle with integer area.at n=23A070147
- Numbers n such that [A070080(n), A070081(n), A070082(n)] is an integer triangle with integer inradius.at n=28A070209
- Interprimes (A024675) which are of the form s*prime, s=2.at n=31A075277
- Numbers m = d_1 d_2 ... d_k (in base 10) with properties that k is even and d_i + d_{k+1-i} = 10 for all i.at n=37A083678
- Semiprimes sandwiched between semiprimes.at n=44A086005
- An "L" digit is a digit "looking to the Left" (1,2,3,7,9); an "R" digit is a digit "looking to the Right" (4,5,6); an "U" digit is a digit "looking at Us" (0,8). This is the slowest increasing sequence showing the infinite pattern [LUR] (when read digit-by-digit).at n=46A093104
- An "L" digit is a digit "looking to the Left" (1,2,3,7,9); an "R" digit is a digit "looking to the Right" (4,5,6); an "U" digit is a digit "looking at Us" (0,8). This is the slowest increasing sequence showing the infinite pattern [URL] (when read digit-by-digit).at n=48A093105
- Triangle, read by rows, of the coefficients of [x^k] in G100228(x)^n such that the row sums are 4^n-1 for n>0, where G100228(x) is the g.f. of A100228.at n=35A100229
- Main diagonal of triangle A100229.at n=7A100230
- Semiprimes with even digits.at n=45A108636
- a(n) = a(n-2) + a(n-3) + a(n-4) + a(n-5) + a(n-6) + a(n-7).at n=22A109538
- a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4, with initial terms 2,5,4,7.at n=16A111570