Yes, right, I made a mistake when removing the printing out of the solutions and just counting the solutions. The result is now: 
$ time perl N_among_M.pl
184756

real    0m0.560s
user    0m0.545s
sys     0m0.015s

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In reply to Re^3: Odometer pattern iterator (in C). (Updated.) by Laurent_R
in thread Odometer pattern iterator (in C). (Updated.) by BrowserUk

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