I asked my 13 year old and she proposed N=4 and (after some prompting) P!=0. I always threatened to rename her "Howitzer Higginbitham IV". You can use her as a

I asked my 13 year old and she proposed N=4 and (after some prompting) P!=0. I always threatened to rename her "Howitzer Higginbitham IV". You can use her as a source.