Properties of the Number -665857

Six Hundred Sixty-Five Thousand Eight Hundred Fifty-Seven

Basics

Value: -665858 → -665857 → -665856

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 37

Digital Root: 1

Palindrome: No

Factorization: 665857

Divisors: 1, 665857

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -10100010100100000001

Octal: -2424401

Duodecimal: -281401

Hexadecimal: -a2901

Square: 443365544449

Square Root: 816.000612744868

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

Expansion of g.f. (1+x)*(3+x)/(1+6·x²+x⁴). A100434

Pell-Lucas numbers: numerators of continued fraction convergents to sqrt(2). A1333

a(0) = 1, a(1) = 3; for n > 1, a(n) = 6·a(n-1) - a(n-2). A1541

Expansion of (1+x)/(1-2·x-x²). A78057

Interleave denominators (A000129) and numerators (A001333) of convergents to sqrt(2). A2965

a(n) = 2·a(n-1)² - 1, if n>1. a(0)=1, a(1)=3. A1601

Numbers such that floor(a(n)² / 8) is again a square. A204514

a(n) = a(-n) = 34·a(n-1) - a(n-2), and a(0)=1, a(1)=17. A56771

Array of ((kⁿ)+(k^-n))/2 where k=(sqrt(x²+1)+x)² for integers x>=1. A188645

a(0) = a(1) = 1; thereafter a(2·n+1) = 2·a(2·n) - a(2·n-1), a(2·n) = 4·a(2·n-1) - a(2·n-2). A79496