Properties of the Number 30490

Thirty Thousand Four Hundred Ninety

Basics

Value: 30489 → 30490 → 30491

Parity: even

Prime: No

Previous Prime: 30469

Next Prime: 30491

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 × 3049

Divisors: 1, 2, 5, 10, 3049, 6098, 15245, 30490

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 111011100011010

Octal: 73432

Duodecimal: 1578A

Hexadecimal: 771a

Square: 929640100

Square Root: 174.61385970191483

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

Number of hexagonal polyominoes (or hexagonal polyforms, or planar polyhexes) with n cells. A228

Recurrence a(n+2) = ∑_k=0..n binomial(n,k)*a(k)*a(n+1-k) with a(0)=1, a(1)=-2. A289068

Number of polyominoes consisting of 10 regular unit n-gons. A120104

Number of multisets of intervals whose multiset union is of size n and covers an initial interval of positive integers with weakly decreasing multiplicities. A356938

a(n) = A273059(4n). A275916

G.f. satisfies: A(x) = A(x²)³ + x·A(x²)². A195200

Erroneous version of A000228. A14558

Maximal troughs in decimal expansions of π: positions of troughs equal to 8. A105276

T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2 or 3 king-move adjacent elements, with upper left element zero. A303727

Triangle read by rows: T(n,k) = number of free hexagonal polyominoes with n cells, where the maximum number of collinear cell centers on any line in the plane is k. A378015