This # makes 3 consecutive calls.  The 1st call rings 4 times, then a 2 minute space.  Then it calls again with another 4 rings, then another 2 minute space.  The 3rd and last call in the sequence comes in with 6 rings sometimes with a 2 minute space from the 2nd call, sometimes with a 3 minute space.  Generally, on any given day, there will be two different #"s that use this same pattern for calls.  This morning it was 517-208-0372 that called.  This afternoon it was  517-295-0442.  The 517-295 exchange #'s are the most frequently used.  But 517-376- and 517-258-  are, also, used with the same pattern.  At the very least, they are annoying, but the few that were answered were either dead air, or became a busy signal from the caller's end, or when someone did respond it was definitely a SCAM call.  I just ignore them.