MathSciNet bibliographic data MR227095 (37 #2680) 10.08 Williams, H. C.; Zarnke, C. R. A report on prime numbers of the forms $M=(6a+1)2\sp{2m-1}-1$$M=(6a+1)2\sp{2m-1}-1$ and $M\sp{\prime} =(6a-1)2\sp{2m}-1$$M\sp{\prime} =(6a-1)2\sp{2m}-1$. Math. Comp. 22 1968 420–422. Article

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