B. Khosravi and S. S. Amiri
On the prime graph of $L_2(q)$, where $q=p^{\alpha}<100$

Let G be a finite group. We construct the prime graph of G as follows: the vertices of this graph are the prime divisors of |G| and two vertices p and q are joined by an edge if and only if G contains an element of order pq. The prime graph of G is denoted by $\Gamma(G)$. Mina Hagie (Comm. Algebra, 2003) determined finite groups G such that $\Gamma(G)=\Gamma(S)$, where S is a sporadic simple group. In this paper we determine finite groups G such that $\Gamma(G)=\Gamma(L_{2}(q))$ for some q<100.

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