Properties of the Number -7215

Two Hundred Fifteen

Basics

Value: -7216 → -7215 → -7214

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 13 × 37

Divisors: 1, 3, 5, 13, 15, 37, 39, 65, 111, 185

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1110000101111

Octal: -16057

Duodecimal: -4213

Hexadecimal: -1c2f

Square: 52056225

Square Root: 84.94115610232768

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

a(n) = 2·a(n-1) + a(n-2) - a(n-3), with a(0) = a(1) = 0, a(2) = 1. A6054

Multiples of 15 containing a 15 in their decimal representation. A121035

a(n) = prime(n)*prime(n+1) - prime(n) - prime(n+1). A37165

Numbers m that are the hypotenuse of exactly 13 distinct integer-sided right triangles, i.e., m² can be written as a sum of two squares in 13 ways. A97102

Numbers k such that k and k + 1 are both Niven numbers in base 3/2 (A342426). A342427

Sum of consecutive nonsquares. A48395

Numbers n such that p(3n) is prime, where p(n) is the number of partitions of n. A111389

3-wave sequence starting with 1, 1, 1. A38196

Let i be in {1,2,3}, let r >= 0 be an integer and n=2·r+i-1. Then a(n)=a(2·r+i-1) gives the quantity of H_7,3,0 tiles in a subdivided H_7,i,r tile after linear scaling by the factor x^r, where x=sqrt((2·cos(π/7))²-1). A187070

a(n) = 5·n² + 10·n. A67724