Properties of the Number 142

One Hundred Forty-Two

Basics

Value: 141 → 142 → 143

Parity: even

Prime: No

Previous Prime: 139

Next Prime: 149

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 2 × 71

Divisors: 1, 2, 71, 142

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001110

Octal: 216

Duodecimal: BA

Hexadecimal: 8e

Square: 20164

Square Root: 11.916375287812984

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

Expansion of ∏_{m >= 1} (1 + x^m); number of partitions of n into distinct parts; number of partitions of n into odd parts. A9

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

Numbers in base 5. A7091

a(n) = 3·n + 1. A16777

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 Collatz or 3x+1 map: a(n) = n/2 if n is even, 3n + 1 if n is odd. A6370

The primes doubled; even semiprimes. A100484

Numbers in base 6. A7092

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