Properties of the Number -1247

Two Hundred Forty-Seven

Basics

Value: -1248 → -1247 → -1246

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 29 × 43

Divisors: 1, 29, 43, 1247

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -10011011111

Octal: -2337

Duodecimal: -87B

Hexadecimal: -4df

Square: 1555009

Square Root: 35.31288716601915

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

Table T(n,k) = -2·T(n-1,k)+T(n-1,k+1) = T(n,k-4), 0<=n. A140287

First quadrisection of A140287. A140289

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 129", based on the 5-celled von Neumann neighborhood. A270220

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 435", based on the 5-celled von Neumann neighborhood. A272152

Irregular triangle T(n,k), n >= 0, 0 <= k <= 2·n+1, read by rows, where T(n,k) = [x^k] (1-x)ⁿ⁺¹ * ∑_k=0..n (2·k+1)ⁿ * x^k. A382289

a(n) = 13 + 12·n - n². A136316

Pentagonal numbers: a(n) = n*(3·n-1)/2. A326

Generalized pentagonal numbers: m*(3·m - 1)/2, m = 0, +-1, +-2, +-3, .... A1318

Numbers that are the sum of 6 positive 5th powers. A3351

a(n) = (prime(n)² - 1)/24. A24702