Properties of the Number -1385

Three Hundred Eighty-Five

Basics

Value: -1386 → -1385 → -1384

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 277

Divisors: 1, 5, 277, 1385

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10101101001

Octal: -2551

Duodecimal: -975

Hexadecimal: -569

Square: 1918225

Square Root: 37.21558813185679

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

Exponential Riordan array (sech(x), tanh(x)). A60081

Real part of the coefficient [xⁿ] of the expansion of (1+i)/(1-i·exp(x)) - 1 multiplied by 2·n!, where i is the imaginary unit. A163982

Numerators of generalized Bernoulli numbers associated with the zigzag numbers A000111. A185424

Triangle of coefficients of Gaussian polynomials [2n+5,5]_q represented as finite sum of terms (1+q²)^k*q^g-k, where k = 0,1,...,g with g=5n. A267485

A Seidel matrix A(n,k) read by antidiagonals upwards. A323833

a(n) = -2ⁿ*(E(n, 1/2) + E(n, 1) + (n mod 2)*2*(E(n+1, 1/2) + E(n+1, 1))), where E(n, x) are the Euler polynomials. A240559

a(n) = E(n) - E(n+1), where E(n) are the Euler numbers A122045(n). A241209

A Seidel matrix A(n,k) read by antidiagonals downwards. A323834

The infinite Seidel matrix H read by antidiagonals upwards; H = (H(n,k): n,k >= 0). A236935

Interleave (-1)ⁿ*(A000182(n+1) - A000364(n)), -A028296(n+1). A239322