Why odd numbers i3,i5 and i7 (cross post) ?

[idata]

I posted this originally under General but I think probably this was the right place to ask this question.

Why intel processors are named i3, i5 and i7 ? Why not i3,i4,i5,i6... ? I tried searching on internet but could not find any satisfactory answer..Can anybody let me know why it is named in odd numbers ?

[idata]

The information on letters and numbers is not longer corresponding to a specific technical features or technology on the Products.

This naming scheme is now divided as low-level units (Core i3), mid-range units (Core i5) and high-end performance processors (Core i7).

These names were selected only for marketing purposes.

[idata]

Thanks Alvaro !!