Properties of the Number -1605

Six Hundred Five

Basics

Value: -1606 → -1605 → -1604

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 107

Divisors: 1, 3, 5, 15, 107, 321, 535, 1605

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11001000101

Octal: -3105

Duodecimal: -B19

Hexadecimal: -645

Square: 2576025

Square Root: 40.06245124802026

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 where T(n,k) = -n!/(n-k)!*[x^k] ( x/log(1-x-x²) )ⁿ⁺¹, for n>=k>=0, read by rows. A118793

McKay-Thompson series of class 12a for Monster. A58489

Triangle where T(n,k) = -n!*[x^k] ( x/log(1-x-x²) )ⁿ⁺¹, for n>=k>=0, read by rows. A118791

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 307", based on the 5-celled von Neumann neighborhood. A271167

A triangle of matrix polynomials: m(n)=antisymmeticmatix(n).pseudotranspose[antisymmeticmatix(n)]. A158336

Triangle read by rows in which row n (n >= 1) gives coefficients in expansion of the polynomial f(n) * ∏_i=1..n-1 f(2i), where f(k) = (1 - x^k)/(1-x). A162206

Number of reduced words of length n in the Weyl group D₆. A162209

Triangle of numbers arising in enumeration of walks on cubic lattice. A52179

Number of log-concave compositions (ordered partitions) of n. A69916

Number of partitions of n for which the number of odd parts is equal to the positive alternating sum of the parts. A277103