Abstract

The first part of this work established, with examples, the fact that there are more than one non-abelian isomorphic types of groups of order n = sp, (s,p) = 1, where s1 was worked out and such groups have no non-abelian isomorphic types. This gave credence to the fact that a group of order 15 and its like do not have a non-abelian isomorphic type. It also generated the non-abelian isomorphic types of groups of order n = spq, where s, p and q are distinct primes considering the congruence relationships between the primes. It was seen that there are more nonabelian isomorphic types when q 1 (mod p), q  1 (mod s) and p  1 (mod s). When q is not congruent to 1 modulo p but congruent to 1 modulo s fewer non-abelian isomorphic types were obtained. Moreover, if q is not congruent to 1 modulo p, q not congruent to 1 modulo s, and p not congruent to 1 modulo s, there cannot be a nonabelian isomorphic type of a group of order n = spq. In this case groups of order n = 2pq, 3pq, 5pq and 7pq were considered. Later, proofs of the number of nonabelian isomorphic types for n =sp and n =spq using the examples earlier generated were given.