? factorint(m-399,11)
  ***   Warning: IFAC: unfactored composite declared prime.
        134428331081347509625933934209198703330373137254073651767125163170665653830685716059521321125830950371244538340566623045518856272502129544097000372715329945526781488417276179529471552048632751514011497970813558214219428196979890713332845442230988918589783350090447674154386505273350776425679423654418233
%13 =
[2 3]

[11 1]

[11953 1]

[134428331081347509625933934209198703330373137254073651767125163170665653830685716059521321125830950371244538340566623045518856272502129544097000372715329945526781488417276179529471552048632751514011497970813558214219428196979890713332845442230988918589783350090447674154386505273350776425679423654418233 1]

? print(factorint(2*m-16,11))
  ***   Warning: IFAC: unfactored composite declared prime.
        283464517990234162138074113118973806414421795133440372637467634466618936150385001748559796893727202671253606099608824633595172362110422591252808477546088575086016417514919524134699595701298522216098483250917313543201587359572229692518157802066152785550807739244387660554477800975580491700003129895878107
[2, 1; 29, 1; 103, 1; 167, 1; 283464517990234162138074113118973806414421795133440372637467634466618936150385001748559796893727202671253606099608824633595172362110422591252808477546088575086016417514919524134699595701298522216098483250917313543201587359572229692518157802066152785550807739244387660554477800975580491700003129895878107, 1]
?