Properties of the Number 145

One Hundred Forty-Five

Basics

Value: 144 → 145 → 146

Parity: odd

Prime: No

Previous Prime: 139

Next Prime: 149

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 5 × 29

Divisors: 1, 5, 29, 145

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10010001

Octal: 221

Duodecimal: 101

Hexadecimal: 91

Square: 21025

Square Root: 12.041594578792296

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

Pentagonal numbers: a(n) = n*(3·n-1)/2. A326

Numbers k such that (35·10^k - 11)/3 is prime. A268448

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

a(n) = n² + 1. A2522

Centered square numbers: a(n) = 2·n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values. A1844

a(n) = 3·n + 1. A16777

a(n) = 4·n + 1. A16813

Generalized pentagonal numbers: m*(3·m - 1)/2, m = 0, +-1, +-2, +-3, .... A1318

Numbers congruent to 1 or 5 mod 6. A7310

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