Properties of the Number -505

Five Hundred Five

Basics

Value: -506 → -505 → -504

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: Yes

Factorization: 5 × 101

Divisors: 1, 5, 101, 505

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -111111001

Octal: -771

Duodecimal: -361

Hexadecimal: -1f9

Square: 255025

Square Root: 22.47220505424423

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) = nearest integer to n² * sin(sqrt(n)). A274088

Row sums of a number triangle related to the Pell numbers. A110331

a(n) = n! - n⁴. A196411

Expansion of r(q⁵) / r(q)⁵ in powers of q where r() is the Rogers-Ramanujan continued fraction. A285585

First differences of A000463. A188652

Sequence is {a(5,n)}, where a(m,n) is defined at sequence A110665. A110670

Matrix inverse of triangle A121335, where A121335(n,k) = C( n*(n+1)/2 + n-k + 1, n-k) for n>=k>=0. A121440

a(1) = 1; a(n) = ∑_k=2..n (-1)^k * k·a(floor(n/k)). A359479

Expansion of η(q)/η(q⁵)⁵ in powers of q. A109063

The c coefficients of the transform a·x² + (4·a/k - b)*x + 4·a/k² + 2·b/k + c = 0 for a,b,c = 1,-1,-1, k = 1,2,3... A229526