Properties of the Number -3081

Eighty-One

Basics

Value: -3082 → -3081 → -3080

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 13 × 79

Divisors: 1, 3, 13, 39, 79, 237, 1027, 3081

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110000001001

Octal: -6011

Duodecimal: -1949

Hexadecimal: -c09

Square: 9492561

Square Root: 55.50675634551167

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

G.f. A(x) satisfies: 4ⁿ - 1 = ∑_k=0..n [x^k] A(x)ⁿ and also satisfies: (4+z)ⁿ - (1+z)ⁿ + zⁿ = ∑_k=0..n [x^k](A(x)+z·x)ⁿ for all z, where [x^k] A(x)ⁿ denotes the coefficient of x^k in A(x)ⁿ. A100228

Numbers k such that (11·10^k + 19)/3 is prime. A270339

Second hexagonal numbers: a(n) = n*(2·n + 1). A14105

Doubly triangular numbers: a(n) = n*(n+1)*(n²+n+2)/8. A2817

a(n) = 4·n² - 10·n + 7. A54554

Numbers that are the sum of 12 positive 10th powers. A4812

a(n) = p*(p-1)/2 for p = prime(n). A8837

a(1)=1, a(n)=a(n-1)+n if n even, a(n)=a(n-1)+n² if n is odd. A136047

Staggered diagonal of triangular spiral in A051682. A81266

Numbers m such that there are precisely 7 groups of order m. A249550