Properties of the Number -8391

Three Hundred Ninety-One

Basics

Value: -8392 → -8391 → -8390

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 2797

Divisors: 1, 3, 2797, 8391

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10000011000111

Octal: -20307

Duodecimal: -4A33

Hexadecimal: -20c7

Square: 70408881

Square Root: 91.60240171523888

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

Coefficients in the expansion of 1/([r] + [2r]x + [3r]x² + ...); [ ] = floor, r = e/2. A279591

Dispersion of (floor(n·e)), by antidiagonals. A191455

Triangle T(n,k), 0 <= k <= n, read by rows, defined by: T(0,0) = 1, T(n,k) = 0 if n<k, T(n,0) = T(n-1,0) + T(n-1,1) and for k >= 1: T(n,k) = T(n-1,k-1) + x·T(n-1,k) + T(n-1,k+1) with x = 3. A110877

Number of integer partitions of n whose length (number of parts) is not equal to the sum of any submultiset. A367213

a(n) = pq + pr + qr with p = prime(n), q = prime(n+1), and r = prime(n+2). A127345

Composites in A127345. A127347

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 7. A252148

T(n,k)=Number of length n+3 0..k arrays with no four elements in a row with pattern aabb (with a≠b) and new values 0..k introduced in 0..k order. A242584

T(n,k)=Number of nXk 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1, 3 or 4 1s. A295652

Numbers k such that there are exactly four biquadratefree powerful numbers (A338325) between k² and (k+1)². A338391