Properties of the Number -1205

Two Hundred Five

Basics

Value: -1206 → -1205 → -1204

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 5 × 241

Divisors: 1, 5, 241, 1205

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -10010110101

Octal: -2265

Duodecimal: -845

Hexadecimal: -4b5

Square: 1452025

Square Root: 34.713109915419565

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

Expansion of e.g.f. 1/(exp(x) - log(1 - x)). A352139

Values of n such that L(4) and N(4) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A226924

Coordination sequence for "cab" 3D uniform tiling formed from octahedra and truncated cubes. A299266

The Riordan square of the Riordan numbers, triangle read by rows, T(n, k) for 0 <= k <= n. A321620

Number of unlabeled rooted trees with at most n nodes. A87803

Numbers n such that the decimal expansions of both n and n² have 0 as smallest digit and 5 as largest digit. A256631

a(0) = 0, a(1) = 1; a(n) = max { 4·a(k) + a(n-k) | 1 <= k <= n/2 }, for n > 1. A116520

Number of negative fundamental discriminants having class number n. A46125

Number of increasing arithmetic progressions in {1,2,3,...,n}, including trivial arithmetic progressions of lengths 1 and 2. A51336

E-toothpick sequence (see Comments lines for definition). A161328