Properties of the Number 30781

Thirty Thousand Seven Hundred Eighty-One

Basics

Value: 30780 → 30781 → 30782

Parity: odd

Prime: Yes

Previous Prime: 30773

Next Prime: 30803

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 30781

Divisors: 1, 30781

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100000111101

Octal: 74075

Duodecimal: 15991

Hexadecimal: 783d

Square: 947469961

Square Root: 175.44514812328097

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

Numbers n such that n!3 - 3 is prime, where n!3 = n!!! is a triple factorial number (A007661). A242994

Primes from merging of 5 successive digits in decimal expansion of π. A104825

Value of D for incrementally largest values of minimal·satisfying Pell equation x²-Dy²=1. A33316

First member of a prime quadruple in a 2p-1 progression. A57327

Expansion of (1 - 3·x - x²)/(1 - 4·x + 2·x³ + x⁴). A195350

Primes p such that A001175(p) = (p-1)/6. A308791

Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|=n-w+|y-z|. A212684

Prime(n) and prime(n+3) use the same digits. A69795

Irregular table with first row containing the single term 3; in the n-th row, n>=2, we list in increasing order those d=2ⁿ⁺¹-a, for each term a in all the preceding rows, such that d is prime. A152871

a(0) = 1 and a(n) = A309807(n) - A309807(n-1) for n > 0. A332955