Properties of the Number -7805

Eight Hundred Five

Basics

Value: -7806 → -7805 → -7804

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 7 × 223

Divisors: 1, 5, 7, 35, 223, 1115, 1561, 7805

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1111001111101

Octal: -17175

Duodecimal: -4625

Hexadecimal: -1e7d

Square: 60918025

Square Root: 88.34591105421914

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

Apply the triangle-to-triangle transformation described in the Comments in A159041 to the triangle in A142459. A225434

Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = -(1/n) * ∑_d∣n μ(n/d) * (-k)^d. A383011

a(n) = ∑_d∣n μ(n/d) * (-n)^d-1. A383012

Number of trivalent connected simple graphs with 2·n nodes and girth at least 4. A14371

a(n) = n*(13·n - 9)/2. A226488

Irregular triangle C(n,g) counting connected trivalent simple graphs on 2n vertices with girth at least g. A185131

Maximal number of pieces obtained by slicing a torus (or a bagel) with n cuts: (n³ + 3·n² + 8·n)/6 (n > 0). A3600

Number of non-unimodal compositions of n covering an initial interval of positive integers. A332743

a(n) is the smallest b > 1 such that prime(n), prime(n+1) and prime(n+2) are all base-b Wieferich primes. A344827

Number of perfect connected undirected simple graphs on n nodes. A52433