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Properties of the Number -8380

Three Hundred Eighty

Basics

Value: -8381 → -8380 → -8379

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 2 × 5 × 419

Divisors: 1, 2, 4, 5, 10, 20, 419, 838, 1676, 2095

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -10000010111100

Octal: -20274

Duodecimal: -4A24

Hexadecimal: -20bc

Square: 70224400

Square Root: 91.54233993076646

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

Triangle T(n,k), 0 <= k <= n, read by rows given by: T(0,0)=1, T(n,k)=0 if k < 0 or if k > n, T(n,0) = 3·T(n-1,0) + T(n-1,1), T(n,k) = T(n-1,k-1) + T(n-1,k) + T(n-1,k+1) for k >= 1. A126954
Diagonal in array of n-gonal numbers A081422. A81437
Number of partitions of n such that the number of even parts is a part. A240573
Successive values·such that the Mordell elliptic curve x3 - y2 = d has extremal points with quadratic extension over the rationals. A200656
Number of 3-antichain covers of a labeled n-set. A56046
Number of ways to cover (without overlapping) a ring lattice (necklace) of n sites with molecules that are 6 sites wide. A58367
E.g.f. A(x) satisfies: x·A(x) equals column 0 in the matrix log of the Riordan array (A(x), x·A(x)). A179421
a(n) equals the coefficient of xn in ∑m>=0 (xm + 1 + 1/xm)m for n >= 1. A316591
Number of ways to write n as an ordered sum of 5 squarefree numbers. A341065
T(n,k) is the number of (n+1) X (k+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). A235175