Properties of the Number -423

Four Hundred Twenty-Three

Basics

Value: -424 → -423 → -422

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 47

Divisors: 1, 3, 9, 47, 141, 423

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110100111

Octal: -647

Duodecimal: -2B3

Hexadecimal: -1a7

Square: 178929

Square Root: 20.566963801203133

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

Values of n such that L(1) and N(1) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A226921

Expansion of 1/(1+3·x*c(x)), c(x) the g.f. of Catalan numbers A000108. A126982

Partial alternating sums of Pillai's arithmetical function (A018804). A370895

G.f.: x^{(k² + k}/2) / (∏_i=1..k (1 - xⁱ) * ∏_r>=1 (1 + x^r)) with k = 2. A246581

G.f.: A(x) = ∑_n=-oo..+oo (x - xⁿ)ⁿ. A290003

a(0)=0; thereafter a(n) = a(n-1)+n if the (n-1)st digit of the sequence is even, otherwise a(n) = a(n-1)-n. A309216

Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. exp(1 - (1+x)^k). A369738

a(n) = -4·a(n-3) + 11·a(n-2) - a(n-1), a(0) = 13, a(1) = -19, a(2) = 162. A153266

Difference between sums of quadratic residues and non-residues modulo n (residues are not necessarily coprime to n). A255644

a(n) = ∑_k=1..n (-1)^k-1 * binomial(k+1,2) * floor(n/k). A366937