Properties of the Number 30986

Thirty Thousand Nine Hundred Eighty-Six

Basics

Value: 30985 → 30986 → 30987

Parity: even

Prime: No

Previous Prime: 30983

Next Prime: 31013

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 × 15493

Divisors: 1, 2, 15493, 30986

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111100100001010

Octal: 74412

Duodecimal: 15B22

Hexadecimal: 790a

Square: 960132196

Square Root: 176.0284067984483

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) = C(2,n) δ C(0,n). A147721

a(n) is the least number k such that A380802(k) = n, or -1 if no such number exists. A380803

Numbers k such that the continued fraction for sqrt(k) has period 47. A20386

a(1) = 1; a(n) = a(n-1) + ∑_k=2..n a(floor(n/k)). A351620

Number of prime pairs {p,q} (p>q) with 3(p-q)-1 and 3(p-q)+1 both prime such that p+(1+(n mod 2))q=n. A219185

3-automorphic numbers ending in 5: final digits of 3·n² agree with n. A30986

A triangular sequence of polynomial coefficients:p(x,n)=Sum[Eulerian[n + 1, k]*Product[x + i, {i, 0, n - k + 1}]*(-x)^k, {k, 0, n}]/x. A174833