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Properties of the Number 75721

Seventy-Five Thousand Seven Hundred Twenty-One

Basics

Value: 75720 → 75721 → 75722

Parity: odd

Prime: Yes

Previous Prime: 75709

Next Prime: 75731

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 75721

Divisors: 1, 75721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10010011111001001

Octal: 223711

Duodecimal: 379A1

Hexadecimal: 127c9

Square: 5733669841

Square Root: 275.17449009673845

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) = Gn(5), where Gn(k) is the Goodstein function defined in A266201. A266204
Primes that are the first in a run of exactly 4 emirps. A346024
Middle of 3 consecutive prime numbers, p1, p2, p3, such that p1·p2·p3·d1·d2 = average of twin prime pairs; d1 (δ) = p2 - p1, d2 (δ) = p3 - p2. A153410
Primes that remain prime through 4 iterations of function f(x) = 9x + 4. A23325
Denominators of the convergents of the continued fraction for L(2, chi3), where L(s, chi3) is the Dirichlet L-function for the non-principal character modulo 3. A153068
4th column of number array A083075. A83079
Primes that remain prime through 5 iterations of the function f(x) = 9x + 4. A23353
Number of binary strings of length n with equal numbers of 0001 and 0101 substrings. A164158
a(n) = 3F0( -n,-n+1,-n+2;;-1)= n!*(n-1)!* 1F2(-n+2;2,3;-1)/2, where nFm(;;z) are generalized hypergeometric series. A174315
Primes of the form 7n2 + 9. A201609