From: Miguel Carrasquer
>Some more details: The numeral is frequently written as 7-an which couldPerhaps *septm. became *septn. (as in Gothic sibun, or Lith. septynì). The
>point to a form PAnatolian *siptan- which could however not to back
>to PIE *septm. (because PIE *-m. securely gives Hitt. -un so /s^ipta-/
>could not be direct descendant either).