Properties of the Number 9028

Nine Thousand Twenty-Eight

Basics

Value: 9027 → 9028 → 9029

Parity: even

Prime: No

Previous Prime: 9013

Next Prime: 9029

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 37 × 61

Divisors: 1, 2, 4, 37, 61, 74, 122, 148, 244, 2257

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10001101000100

Octal: 21504

Duodecimal: 5284

Hexadecimal: 2344

Square: 81504784

Square Root: 95.01578816175763

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) = ∑_k=0..n-1 T(n,k) * T(n,k+1), with T given by A026615. A26957

Number of ways to tile a 4 X n region with 1 X 1, 2 X 2, 3 X 3 and 4 X 4 tiles. A54856

Number of tilings of a 9 X n rectangle using integer-sided square tiles. A219928

Numbers k such that 5^k + 6 is prime. A89142

a(n) = 12·a(n-1) - 34·a(n-2), for n > 1, with a(0) = 1, a(1) = 14. A164598

Length of the maximal prefix of noncomposite numbers on row n of A249821. A250473

Consider coefficients U(m,L,k) defined by the identity ∑_k=1..L ∑_j=0..m A302971(m,j)/A304042(m,j) * k^j * (T-k)^j = ∑_k=0..m (-1)^m-k * U(m,L,k) * T^k that holds for all positive integers L,m,T. This sequence gives 4-column table read by rows, where the n-th row lists coefficients U(3,n,k) for k = 0, 1, 2, 3; n >= 1. A316387

Numbers k such that σ(φ(k))-φ(σ(k)) is nonzero and divisible by φ(k), that is A065395(k)/A000010(k) is a nonzero integer. A92587

Expansion of x*(125 + 8028·x + 42237·x² + 42272·x³ + 8007·x⁴ + 132·x⁵ - x⁶) / (1 - x)⁸. A317981

Number of loopless rooted planar maps with 3 faces and n vertices and no isthmuses. Also a(n)=T(4,n-3), array T as in A049600. A6416