MathSciNet bibliographic data MR337732 (49 #2501) 10A20 Ecklund, E. F., Jr.; Erdös, P.; Selfridge, J. L. A new function associated with the prime factors of \$(\sp{n}\sb{k})\$$(\sp{n}\sb{k})$. Math. Comp. 28 (1974), 647–649. Article

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