Properties of the Number 158

One Hundred Fifty-Eight

Basics

Value: 157 → 158 → 159

Parity: even

Prime: No

Previous Prime: 157

Next Prime: 163

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 79

Divisors: 1, 2, 79, 158

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110

Octal: 236

Duodecimal: 112

Hexadecimal: 9e

Square: 24964

Square Root: 12.569805089976535

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

a(n) = ∑_k=1..n floor(n/k); also ∑_k=1..n d(k), where d = number of divisors (A000005); also number of solutions to x·y = z with 1 <= x,y,z <= n. A6218

Positive integers congruent to 2 (mod 4): a(n) = 4·n+2, for n >= 0. A16825

The primes doubled; even semiprimes. A100484

a(n) = 3·n + 2. A16789

a(n) = prime(n) + 1. A8864

Permutation of natural numbers: a(n) = (A003961(n)+1) / 2 [where A003961(n) shifts the prime factorization of n one step towards larger primes]. A48673

Composite squarefree numbers. A120944

Finitary numbers. Matula-Goebel numbers of rooted identity trees. A276625

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