Properties of the Number 8105

Eight Thousand One Hundred Five

Basics

Value: 8104 → 8105 → 8106

Parity: odd

Prime: No

Previous Prime: 8101

Next Prime: 8111

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 5 × 1621

Divisors: 1, 5, 1621, 8105

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 1111110101001

Octal: 17651

Duodecimal: 4835

Hexadecimal: 1fa9

Square: 65691025

Square Root: 90.02777349240623

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

Number of magic labelings of the prism graph I X C₅ with magic sum n. A244497

T(n,k)=Number of nXk 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 0 or 2 neighboring 1s. A297338

Sum of the seventh largest parts in the partitions of n into 8 parts. A308991

Averages of four consecutive odd squares. A173960

Bisect A053445 then calculate the first differences of the resulting sequence. A160643

Triangle read by rows. Number T(n, k) of partitions of the multiset [1, 1, 1, 1, 2, 2, 2, 2, ..., n, n, n, n] into k nonempty submultisets, for 1 <= k <= 4n. A358722

Row sums of triangle A027420. A241944

E.g.f. satisfies A(x) = exp( x·A(x)⁴/(1 - x·A(x)²) ). A361143

a(n) = (d(n) - r(n))/5, where d = A026037 and r is the periodic sequence with fundamental period (1,2,0,2,0). A26039

Denominators of continued fraction convergents to sqrt(391). A41743