Properties of the Number -7750

Seven Hundred Fifty

Basics

Value: -7751 → -7750 → -7749

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 5 ³ × 31

Divisors: 1, 2, 5, 10, 25, 31, 50, 62, 125, 155

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1111001000110

Octal: -17106

Duodecimal: -459A

Hexadecimal: -1e46

Square: 60062500

Square Root: 88.03408430829505

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

Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = ∑_d∣n φ(n/d) * (-k)^d-1. A382995

a(n) = ∑_d∣n φ(n/d) * (-n)^d-1. A382998

Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = -(1/n) * ∑_d∣n φ(n/d) * (-k)^d. A382993

Centered 9-gonal (also known as nonagonal or enneagonal) numbers. Every third triangular number, starting with a(1)=1. A60544

Hypotenuses for which there exist exactly 3 distinct integer triangles. A84647

a(n) = 2·n*(4·n + 1). A33585

Integers that are Rhonda numbers to base 30. A255736

Positive integers not expressible as the sum of a prime and a triangular number. A76768

a(n) = A063997(n)/4. A88406

Number of orientable strings of length n using a maximum of k colors, array read by descending antidiagonals, T(n,k) for n >= 1 and k >= 1. A293500