Usage: factor [options] "expression to factor"
      --trial=N       Set trial division maximum to N
      --ecm-primes=N  Limit ECM to first N primes (use - for no limit)
      --nfs-chars=N   Use N quadratic characters in NFS
      --nfs-verbose   Show complete lists in NFS verbose messages
  -v  --verbose       Enable verbose messages
  -t  --timestamp     Prepend verbose messages with timestamp
      --version       Print version
  -h  --help          Show help
Example input expressions:
  2047               Concrete integer
  2^2^7 + 1          Integer expression
  N[100]             Random 100-bit positive integer
  P[50] * P[50]      Product of random 50-bit primes
  x^4 - 10*x^2 + 1   Polynomial over the integers
  x^5^2 - x (mod 5)  Polynomial over GF(5)
Let expressions are supported: let p = P[4] in x^p - x (mod p)
Multivariate polynomials (e.g., y^2 - x^3 - a*x - b) are not supported