Properties of the Number 345

Three Hundred Forty-Five

Basics

Value: 344 → 345 → 346

Parity: odd

Prime: No

Previous Prime: 337

Next Prime: 347

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 23

Divisors: 1, 3, 5, 15, 23, 69, 115, 345

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101011001

Octal: 531

Duodecimal: 249

Hexadecimal: 159

Square: 119025

Square Root: 18.57417562100671

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

Triangle read by rows: T(n,k) = ∑_j>=0 j!*T(n-j-1, k-1) for n >= 0, k >= 0. A84938

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

Sphenic numbers: products of 3 distinct primes. A7304

Second pentagonal numbers: a(n) = n*(3·n + 1)/2. A5449

Numbers k that divide the (right) concatenation of all numbers <= k written in base 25 (most significant digit on left). A29470

Number of fractions in Farey series of order n. A5728

Self numbers or Colombian numbers (numbers that are not of the form m + sum of digits of m for any m). A3052

a(n) = a(n-1) + a(n-4) with a(0) = 0, a(1) = a(2) = a(3) = 1. A3269

Number of "ON" cells at n-th stage in the "Ulam-Warburton" two-dimensional cellular automaton. A147562

Numbers that are the sum of 3 positive cubes. A3072