title: inline_formset auto_id starting from a custom number
body: <p>Django user here.</p>
  <p>I want my first fields in my inline formsets start from a custom number, like 7 for example :</p>
  <pre><code>&lt;input type=&quot;text&quot; name=&quot;prescriptiondetails-7-unit&quot; maxlength=&quot;100&quot; class=&quot; form-control-sm  form-control &quot; id=&quot;id_prescriptiondetails-7-unit&quot; value=&quot;&quot;&gt;
  &lt;input type=&quot;text&quot; name=&quot;prescriptiondetails-7-sqf&quot; maxlength=&quot;100&quot; class=&quot; form-control-sm  form-control &quot; id=&quot;id_prescriptiondetails-7-sqf&quot; value=&quot;&quot;&gt;
  ...
  
  </code></pre>
  <p>here my view</p>
  <pre><code>class add_prescriptiondetail_field_form_hx(AddMixin_hx):
      model = Prescription
      form_class = PrescriptionForm
      success_url = reverse_lazy('prescriptions:list_prescription')
      template_name = __name__.split(&quot;.&quot;)[-2] + '/' + 'prescriptiondetail_field_hx.html'
  
      wire_dict = wire_dict_init
  
      def get_context_data(self, *args, **kwargs):
          context = super().get_context_data(*args, **kwargs)
  
          formset_prefix = 'prescriptiondetails'
          context['formset_prefix'] = formset_prefix
  
          from django.forms.formsets import INITIAL_FORM_COUNT
  
   
          from .forms import PrescriptionDetailForm
          from .models import PrescriptionDetail
          form_set = PrescriptionDetailFormSet = inlineformset_factory(Prescription, PrescriptionDetail, 
                                              form=PrescriptionDetailForm, 
                                              fields = ['unit', 'sqf'], 
                                              extra=0,
                                              max_num=10, min_num=1,
                                              
                                              can_delete=True
          )
          
          
          context['prescriptiondetail'] = form_set
          #           
          return context
  </code></pre>
  <p>how can I tell django to start from count 7 and not render the form fields id and names from 0</p>
  <p>NB : Not interested in JS solutions.</p>
  <p>I've been pulling my hair for a whole day, read the doc in and out ... but without luck</p>
  <p>thank you guys</p>