Properties of the Number 18812

Eighteen Thousand Eight Hundred Twelve

Basics

Value: 18811 → 18812 → 18813

Parity: even

Prime: No

Previous Prime: 18803

Next Prime: 18839

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 4703

Divisors: 1, 2, 4, 4703, 9406, 18812

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100101111100

Octal: 44574

Duodecimal: AA78

Hexadecimal: 497c

Square: 353891344

Square Root: 137.15684452479942

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Solution of the complementary equation a(n) = 2·a(n-1) - a(n-2) + b(n-1) + 2, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences. A294870

Number of -1..1 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^t+u+v) having two, three, four, five or six distinct values for every i,j,k<=n. A211530

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 438", based on the 5-celled von Neumann neighborhood. A272219

Number of ordered quadruples of integers from [ 2,n ] with no common factors between triples. A15639

Numbers n such that 117·2ⁿ-1 is prime. A50584

Linear recurrence with signature (1,1,-1,1,1), where the first terms are powers of 2 (1,2,4,8,16). A294364

Number of lines through exactly 5 points of an n X n grid of points. A18812

Number of (n+1)X(7+1) arrays of permutations of 0..n·8+7 with each element having directed index change 0,0 0,1 1,0 or -1,-2. A264284