Properties of the Number -1555

Five Hundred Fifty-Five

Basics

Value: -1556 → -1555 → -1554

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 311

Divisors: 1, 5, 311, 1555

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11000010011

Octal: -3023

Duodecimal: -A97

Hexadecimal: -613

Square: 2418025

Square Root: 39.433488306260706

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

A transform of the Fibonacci numbers. A99505

a(n) = ∑_{k=0..floor(n/3)} (-1)^k * binomial(n-2·k,k) * Catalan(k). A360025

Expansion of e.g.f. 1/(1 + (exp(x) - 1)/(1 + (exp(x) - 1)²/(1 + (exp(x) - 1)³/(1 + ...)))), a continued fraction. A301923

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 441", based on the 5-celled von Neumann neighborhood. A272224

Number of compositions (ordered partitions) of n into distinct parts. A32020

a(n) = (6ⁿ - 1)/5. A3464

a(n) = least k such that the remainder when 5^k is divided by k is n. A119679

Discriminants of imaginary quadratic fields with class number 4 (negated). A13658

Numbers k such that k² divides 6^k-1. A127106

Number of partitions of n that do not contain 2 as a part. A27336