Properties of the Number 28911

Twenty-Eight Thousand Nine Hundred Eleven

Basics

Value: 28910 → 28911 → 28912

Parity: odd

Prime: No

Previous Prime: 28909

Next Prime: 28921

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 23 × 419

Divisors: 1, 3, 23, 69, 419, 1257, 9637, 28911

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000011101111

Octal: 70357

Duodecimal: 14893

Hexadecimal: 70ef

Square: 835845921

Square Root: 170.03234986319515

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

Expansion of g.f. A(x) satisfying ∑_n=-oo..+oo (xⁿ - 8·A(x))ⁿ = 1 - 6*∑_n>=1 x^n². A370038

Number of paths of length n in the first quadrant, starting at the origin and consisting of 2 kinds of upsteps U=(1,1) (U1 and U2), 3 kinds of flatsteps F=(1,0) (F1, F2 and F3) and 1 kind of downsteps D=(1,-1). A134425

Expansion of 1/(x^k*(1-x-2·x^k+1)) for k=7. A143450

Crystal ball sequence for E₇ lattice. A8398

Number of binary strings of length n with no substrings equal to 0001 0111 or 1010. A164483

Numbers m such that σ(m) = τ(m)! where σ(k) = A000203(k) and τ(k) = A000005(k). A351866

Table in which the g.f. of row n, R(n,x), satisfies ∑_k=-oo..+oo (x^k - n·R(n,x))^k = 1 - (n-2)*∑_k>=1 x^k², for n >= 1, as read by antidiagonals. A370030

Sort digits of primes into descending order (A028906) then sort this sequence into ascending order. A28911

a(n) = sqrt( ∏_j=1..n ∏_k=1..6 (4·sin((2·j-1)*π/(2·n))² + 4·sin((2·k-1)*π/6)²) ). A341545