Properties of the Number 18930

Eighteen Thousand Nine Hundred Thirty

Basics

Value: 18929 → 18930 → 18931

Parity: even

Prime: No

Previous Prime: 18919

Next Prime: 18947

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 631

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 631, 1262

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 100100111110010

Octal: 44762

Duodecimal: AB56

Hexadecimal: 49f2

Square: 358344900

Square Root: 137.58633653092156

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

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X3 or 3X2 subblock having exactly one clockwise edge increases. A207050

T(n,k)=Number of nXk 0..2 arrays with every element equal to some element at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) (1,-1) or (1,0) both plus 1 mod 3 and minus 1 mod 3, with new values introduced in order 0..2. A277788

Principal diagonal of the convolution array A213828. A213829

Number of nonnegative integer 3 X 3 matrices with sum of elements equal to n, up to rotational symmetry. A54771

Number of nX3 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A317736

a(0) = 1, a(n) = 28·n² + 2 for n>0. A10018

Number of (n+1) X 3 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases. A207044

Smallest number k such that P = k·prime(n+1)*(prime(n)-1)+1, Q = k·prime(n+1)*P+1, R = (prime(n)-1)*Q+1 and P, Q, and R are all prime numbers. A245016

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 3 6 or 7. A252525

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101. A260602