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a guest Aug 20th, 2019 70 Never
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  1. $ python rosetta.py 5000000 | shuf -n2
  2. 1099489
  3. 4113097
  4.  
  5. $ calc '1099489*4113097'
  6. 4522304907433
  7.  
  8. $ pypy easy_primes.py -f 4522304907433 -t 1100000 -v
  9. Largest prime 1100009
  10. Searching for factors of 4522304907433 up to 2126572 (except not really)
  11. Previously unfound/unknown prime: 4113097
  12. Successfully found factors: 1099489 * 4113097
  13.  
  14. $ python3
  15. >>> base64.b16encode(int.to_bytes(4522304907433, length=8, byteorder='big', signed=True))
  16. b'0000041CEE60A8A9'
  17. >>> list(map(int, int.to_bytes(4522304907433, length=8, byteorder='big', signed=True)))
  18. [0, 0, 4, 28, 238, 96, 168, 169]
  19. >>> list(map(int, int.to_bytes(1099489, length=8, byteorder='big', signed=True)))
  20. [0, 0, 0, 0, 0, 16, 198, 225]
  21. >>> list(map(int, int.to_bytes(4113097, length=8, byteorder='big', signed=True)))
  22. [0, 0, 0, 0, 0, 62, 194, 201]
  23.  
  24. $ python2
  25. >>> from scipy.fftpack import (fft, ifft)
  26. >>> import numpy as np
  27. >>> ifft(np.multiply(fft([0, 0, 0, 0, 0, 16, 198, 225]), fft([0, 0, 0, 0, 0, 62, 194, 201]))).real
  28. array([-7.27595761e-12,  0.00000000e+00,  9.92000000e+02,  1.53800000e+04,
  29.         5.55780000e+04,  8.34480000e+04,  4.52250000e+04, -7.27595761e-12])
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