Properties of the Number 18185

Eighteen Thousand One Hundred Eighty-Five

Basics

Value: 18184 → 18185 → 18186

Parity: odd

Prime: No

Previous Prime: 18181

Next Prime: 18191

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 3637

Divisors: 1, 5, 3637, 18185

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011100001001

Octal: 43411

Duodecimal: A635

Hexadecimal: 4709

Square: 330694225

Square Root: 134.8517704741024

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) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = floor(n/2), s = (natural numbers >= 3), t = (Fibonacci numbers). A24315

Sum of n-th prime squared and n-th perfect square. A106587

Positive numbers y such that y² is of the form x²+(x+577)² with integer x. A159626

3·n analog to Keith numbers. A282758

Define the sequence T(a(0), a(1)) by a(n+2) is the greatest integer such that a(n+2)/a(n+1) < a(n+1)/a(n) for n >= 0. This is T(7,50). A22037

a(0)=1; a(1)=1; a(n)= a(n-1) + floor(sqrt(a(n-1)*a(n-2))) + floor(sqrt(a(n-3)*a(n-4))) + .... A43328

Number of binary strings of length n with no substrings equal to 0010 0100 or 1001. A164491

a(n) = sum of the first n primes whose distance to next prime is 4. A360226

a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers >= 3), t = (F(2), F(3), F(4), ...). A24878

Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 15. A51980