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Properties of the Number 15825

Fifteen Thousand Eight Hundred Twenty-Five

Basics

Value: 15824 → 15825 → 15826

Parity: odd

Prime: No

Previous Prime: 15823

Next Prime: 15859

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 2 × 211

Divisors: 1, 3, 5, 15, 25, 75, 211, 633, 1055, 3165

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11110111010001

Octal: 36721

Duodecimal: 91A9

Hexadecimal: 3dd1

Square: 250430625

Square Root: 125.79745625409124

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

Number of partitions of n in which the sequence of the sum of the same summands is nondecreasing. A304405
T(n,k)=Number of nXk 0..4 arrays with each element·equal to the number of its horizontal and vertical neighbors equal to 3,3,0,2,2 for x=0,1,2,3,4. A197457
Number of parallelogram polyominoes of site-perimeter n (also called staircase polyominoes, although that term is overused). A75125
Number of n X 2 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 3 1s. A295091
Numerators of continued fraction convergents to sqrt(255). A41478
Column 3 of A052250. A52251
Size of the equivalence class of Sn containing the identity permutation under transformations of positionally adjacent elements of the form abc <--> acb <--> cba where a<b<c. A212418
Number of nX5 0..4 arrays with each element·equal to the number its horizontal and vertical neighbors equal to 3,3,0,2,2 for x=0,1,2,3,4. A197454
Numbers k such that k!4 + 22 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662). A291122
Numbers k that divide s(k), where s(1)=1, s(j)=21·s(j-1)+j. A14872