Properties of the Number 28287

Twenty-Eight Thousand Two Hundred Eighty-Seven

Basics

Value: 28286 → 28287 → 28288

Parity: odd

Prime: No

Previous Prime: 28283

Next Prime: 28289

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 × 449

Divisors: 1, 3, 7, 9, 21, 63, 449, 1347, 3143, 4041

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111001111111

Octal: 67177

Duodecimal: 14453

Hexadecimal: 6e7f

Square: 800154369

Square Root: 168.18739548491735

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

Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 414", based on the 5-celled von Neumann neighborhood. A282008

Triangle, read by rows, defined by T(n,k) = T(n-1,k) + T(n,k-1) for nk>0, where T(n,0) = T(n-1,0) + T(n-1,n-1) and T(n,n) = T(n,n-1) for n>0 with T(0,0)=1. A129577

Row sums of triangle A129577. A129580

Number of terms of A061681 having length = n in decimal representation. A130890

Number of chirotopes resulting from realizable uniform oriented matroids of rank 3 over a ground set of n elements modulo permutations. A172144

Number of 6-ary rooted trees with n nodes and height at most 8. A36625

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111-0100 pattern in any orientation. A146856

a(n) = a(n-1) + a(n-2) + gcd(a(n-1), n), a(1) = a(2) = 1. A360884

Odd elements (greater than 1) to right of central elements in 4-Pascal triangle A028275. A28287

a(1)=1, a(n) = the smallest integer > a(n-1) that is divisible by the number of divisors of a(n-1). A141452