Properties of the Number -380

Three Hundred Eighty

Basics

Value: -381 → -380 → -379

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 19

Divisors: 1, 2, 4, 5, 10, 19, 20, 38, 76, 95

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101111100

Octal: -574

Duodecimal: -278

Hexadecimal: -17c

Square: 144400

Square Root: 19.493588689617926

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

Define E(n) = ∑_{k >= 0} (-1)^floor(k/3)*kⁿ/k! for n = 0,1,2,... . Then E(n) is an integral linear combination of E(0), E(1) and E(2). This sequence lists the coefficients of E(0). A143628

a(n) = n!*LaguerreL(n, n). A277423

Determinant of rank n matrix of 1..n² filled successively along antidiagonals. A69480

Expansion of ∏_k>=1 (1 - x^k * (1 + x)). A306565

Sum of the inverse permutation of EKG-sequence, A064664, and its Dirichlet inverse, A323411. A323412

Expansion of g.f. (theta₃(x) - 1)/2 * ∏_n>=1 (1 - x^4·n-2) / (1 - x^4·n). A370153

Triangle read by rows: T(r,c)=T(r,c-1)+T(r,c+1)+T(r-1,c-1). A129394

a(n) = a(n-2) - (a(n-1) - a(n-2)) if (n mod 2) = 0, otherwise a(n) = a(n-1) - (a(n-3) - a(n-4)), with a(0) = 0, a(1) = 1, a(2) = -1, a(3) = 2. A135690

A symmetrical triangle sequence: T(n, k) = q^k + q^n-k - qⁿ, with q=2. A176224

a(2·n) = A000217(n), a(2·n+1) = -2·A000217(n). A131259