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Dec 8, 2010 at 15:59 comment added S. Carnahan The following sporadic simple groups have order $p+1$ for $p$ a prime: $M_{11}$, $HS$, $M_{23}$, $O'N$, $Fi_{22}$, $J_4$.
Dec 8, 2010 at 15:21 history answered S. Carnahan CC BY-SA 2.5