6286
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 10800
- Proper Divisor Sum (Aliquot Sum)
- 4514
- 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
- 2688
- Möbius Function
- -1
- Radical
- 6286
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 106
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Number of positive integers <= 2^n of form x^2 + 4 y^2.at n=15A000072
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite ANA = Analcime Na16[ Al16Si32O96 ] . 16 H2O.at n=5A018976
- Convolution of odd numbers and A001950.at n=18A023659
- a(n) = T(n,n-3), T given by A026568. Also a(n) = number of integer strings s(0),...,s(n) counted by T, such that s(n)=3.at n=9A026572
- Duplicate of A026572.at n=9A026588
- Squarefree n such that the elliptic curve n*y^2 = x^3 - x arising in the "congruent number" problem has rank 3.at n=7A062693
- a(1) = 1, a(n) = a(n - 1) + pi(a(n - 1)) + 1.at n=36A065962
- a(n) = a(n-1) + a(n-2) + a(n-3) + R(a(n-4)) where a(0)=a(1)=a(2)=a(3)=1 and R(n) (A004086) is the reverse of n.at n=15A074863
- a(n) = floor((product of first n triangular numbers)/(sum of first n factorials)).at n=8A090902
- Write the natural numbers as an infinite sequence of digits, starting at the left; a(n) is the subset (i.e., the position in this sequence of the "counting digits") of the first digit of the n-th square.at n=42A105314
- Start with 1 and repeatedly reverse the digits and add 37 to get the next term.at n=21A118633
- a(n) = 3 + floor((2 + Sum_{j=1..n-1} a(j))/5).at n=42A120172
- A monotonic doubly-fractal sequence. Erase the last (rightmost) digit of every integer: what is left is the sequence itself. The erased digits, one by one, form also the sequence itself.at n=32A127204
- Numbers whose square is a permutational number A134640.at n=24A134742
- 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), (0, 0, 1), (0, 1, 0), (0, 1, 1), (1, 0, 1)}.at n=6A151243
- Triangle T, read by rows, where the matrix square T^2 results in shifting T right one column to drop the secondary diagonal.at n=29A152391
- Column 1 of triangle A152391.at n=6A152393
- Numbers k such that 2^k + 27 is prime.at n=32A157007
- Ordered differences of numbers 3^j-2^j, as in A001047.at n=23A205105
- Nonnegative integers whose English number-words have the identical number of letters contributing to each represented letter-frequency.at n=52A216163