Properties of the Number 143

One Hundred Forty-Three

Basics

Value: 142 → 143 → 144

Parity: odd

Prime: No

Previous Prime: 139

Next Prime: 149

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 11 × 13

Divisors: 1, 11, 13, 143

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001111

Octal: 217

Duodecimal: BB

Hexadecimal: 8f

Square: 20449

Square Root: 11.958260743101398

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

Semiprimes (or biprimes): products of two primes. A1358

Squarefree semiprimes: Numbers that are the product of two distinct primes. A6881

The squarefree numbers ordered lexicographically by their prime factorization (with factors written in decreasing order). a(n) = ∏_{k in I} prime(k+1), where I is the set of indices of nonzero binary digits in n = ∑_{k in I} 2^k. A19565

Numbers in base 5. A7091

a(n) = n*(n+2) = (n+1)² - 1. A5563

a(n) = Fibonacci(n) - 1. A71

Upper Wythoff sequence (a Beatty sequence): a(n) = floor(n*φ²), where φ = (1+sqrt(5))/2. A1950

Numbers congruent to 1 or 5 mod 6. A7310

a(n) = 4·n + 3. A4767

Numbers in base 6. A7092

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