Properties of the Number 205

Two Hundred Five

Basics

Value: 204 → 205 → 206

Parity: odd

Prime: No

Previous Prime: 199

Next Prime: 211

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 5 × 41

Divisors: 1, 5, 41, 205

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001101

Octal: 315

Duodecimal: 151

Hexadecimal: cd

Square: 42025

Square Root: 14.317821063276353

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

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

Lucky numbers. A959

a(n) = 4·n + 1. A16813

Triangle read by rows, Bell transform of Bell numbers. A264428

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

a(n) = 6·n + 1. A16921

Odd semiprimes: odd numbers divisible by exactly 2 primes (counted with multiplicity). A46315

Numbers having only prime factors of form prime(prime); a(1)=1. A76610

Numbers that contain a digit 0. A11540

Number of inseparable partitions of n; see Comments. A325535

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