and 11 again!
hyper-permutable prime! All the combinations and permutations (with 1 or 2 or 3 figures) are prime! or not?
Are you referring to Hypercentrally embedded subgroup?See reference (google books):http://books.google.ca/books?id=nw9ujImV3pwC&pg=PA393&lpg=PA393&dq=Hypercentrally+embedded+subgroup&source=bl&ots=cGgeazmtWD&sig=iqXlNifog2oBnHADzW7xb2rVRP0&hl=en&ei=RAoqTeahNI_EsAO4vq22CA&sa=X&oi=book_result&ct=result&resnum=3&ved=0CCUQ6AEwAjgK#v=onepage&q=Hypercentrally%20embedded%20subgroup&f=false
Or google: Canadian Mathematical Bulletin Dec 1989, Hypercentrally embedded subgroup