Properties of the Number 8385

Eight Thousand Three Hundred Eighty-Five

Basics

Value: 8384 → 8385 → 8386

Parity: odd

Prime: No

Previous Prime: 8377

Next Prime: 8387

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 13 × 43

Divisors: 1, 3, 5, 13, 15, 39, 43, 65, 129, 195

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10000011000001

Octal: 20301

Duodecimal: 4A29

Hexadecimal: 20c1

Square: 70308225

Square Root: 91.56964562561112

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

a(n) = (2·n+1)*(4·n+1). A14634

Staggered diagonal of triangular spiral in A051682. A81266

Array T(n,k) read by antidiagonals: T(n,k) is the number of [n,k]-triangulations in the plane, n >= 0, k >= 0. A169808

Array read by ascending antidiagonals: T(n,k) is the k-th positive integer that is digitally balanced in base n. A378000

Define the sequence UD(a(0),a(1)) by a(n) is the least integer such that a(n)/a(n-1) > a(n-1)/a(n-2)+1 for even n >= 2 and such that a(n)/a(n-1) > a(n-1)/a(n-2) for odd n>=2. This is UD(2,16). A22018

a(n) = n*(11·n+1)/2. A22269

a(n) = numerator of the X-coordinate of n·P where P is the generator [0,0] for rational points on the curve y² + y = x³ - x. A28940

The (2ⁿ+1)-th triangular number (cf. A000217). A28401

Numbers n such that nextprime(n³)-prevprime(n³) = 4. A90121

Triangular numbers with property that digits alternate in parity. A68882