Properties of the Number 25945

Twenty-Five Thousand Nine Hundred Forty-Five

Basics

Value: 25944 → 25945 → 25946

Parity: odd

Prime: No

Previous Prime: 25943

Next Prime: 25951

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 5 × 5189

Divisors: 1, 5, 5189, 25945

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110010101011001

Octal: 62531

Duodecimal: 13021

Hexadecimal: 6559

Square: 673143025

Square Root: 161.07451691686057

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

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having the same number of equal diagonal or antidiagonal elements, and new values 0..3 introduced in row major order. A206383

Irregular triangle read by rows: T(n,k) is the sum of the widths of the free polyominoes with n cells and width k, n >= 1, 1 <= k <= ceiling(n/2). A379637

Number of (n+1) X 3 0..3 arrays with every 2 X 2 subblock having the same number of equal diagonal or antidiagonal elements, and new values 0..3 introduced in row major order. A206377

Number of (n+1)X4 0..3 arrays with every 2X2 subblock having the same number of equal diagonal or antidiagonal elements, and new values 0..3 introduced in row major order. A206378

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 419", based on the 5-celled von Neumann neighborhood. A272047

Numbers k such that k!6 + 6 is prime, where k!6 is the sextuple factorial number (A085158 ). A287956

a(n) = ∑_{k=0..floor(n/3)} (-1)^k * (n-k)!/(k! * (n-3·k)!). A358613

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (1, 0, -1), (1, 1, -1), (1, 1, 1)}. A149726

Triangle: m=5; e(n,k,n)=(k + m - 1)*e(n - 1, k, m) + (m·n - k + 1 - m)*e(n - 1, k - 1, m); t(n,k)=e(n,k,m)+e(n,n-k,m). A156188

Expansion of (1/(1-x-2x²))*c(x/(1-x-2x²)), c(x) the g.f. of A000108. A179533