Properties of the Number 2905

Two Thousand Nine Hundred Five

Basics

Value: 2904 → 2905 → 2906

Parity: odd

Prime: No

Previous Prime: 2903

Next Prime: 2909

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 7 × 83

Divisors: 1, 5, 7, 35, 83, 415, 581, 2905

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101101011001

Octal: 5531

Duodecimal: 1821

Hexadecimal: b59

Square: 8439025

Square Root: 53.898051912847464

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 ordered rooted trees with n non-root nodes and all outdegrees <= three. A36765

Numbers n such that the decimal expansions of both n and n² have 0 as smallest digit and 9 as largest digit. A256709

Number of integer compositions of n with all distinct even-indexed parts and all distinct odd-indexed parts. A351018

Concentric 22-gonal numbers. A195149

Non-palindromic balanced numbers (in base 10). A256075

a(n) = 6·n² + 1. A227776

Positions of 19 after decimal point in decimal expansion of π. A134219

Numbers n such that N = n³ is a twin rank (A002822: 6N +- 1 are twin primes). A326234

a(n) is the largest term encountered on the path to 0 when iterating the map x -> x', and starting from x = A351255(n). Here x' means the arithmetic derivative of x, A003415. A351261

Let A(n) = #{(i,j,k): i² + j² + k² <= n}, V(n) = (4/3)π*n^3/2, P(n) = A(n) - V(n); A000092 gives values of n where |P(n)| sets a new record; sequence gives (nearest integer to, I believe) P(A000092(n)). A223

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