Properties of the Number 13243

Thirteen Thousand Two Hundred Forty-Three

Basics

Value: 13242 → 13243 → 13244

Parity: odd

Prime: No

Previous Prime: 13241

Next Prime: 13249

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 17 × 19 × 41

Divisors: 1, 17, 19, 41, 323, 697, 779, 13243

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001110111011

Octal: 31673

Duodecimal: 77B7

Hexadecimal: 33bb

Square: 175377049

Square Root: 115.0782342582645

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

Riordan array (1/sqrt(1-2·x-3·x²), M(x)-1) where M(x) is the g.f. of the Motzkin numbers A001006. A114422

Fourth column (r=3) of FS(3) staircase array A062745. A62748

Coefficients in asymptotic expansion of sequence A051296. A260530

Expansion of (1-x)*(1-3·x)/(1-9·x+28·x²-35·x³+15·x⁴-x⁵). A224422

Expansion of 1/(1 - x - 4·x² + 3·x³ + 3·x⁴ - x⁵). A231181

Numbers n such that the digits of σ(n) are exactly the same (albeit in different order) as the digits of φ(n), in base 10. A175795

Numerator of sum of reciprocals of first n pentatope numbers A000332. A118411

Coefficients for the nonnegative powers of ρ(11) = 2·cos(π/11) when written in the power basis of the degree 5 number field Q(ρ(11)). Coefficients for the zeroth and fourth powers. A231182

Consider primitive pairs of integers (b, c) with b > 0 such that x⁵ + b·x + c = 0 is irreducible and solvable by radicals: sequence gives values of c. A371554

Terms of Binary Gleichniszahlen-Reihe (BGR) sequence A045998 converted into decimal (Look and Say Sequence, mod 2, read in binary and converted to decimal). A48522