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A. J. C. Cunningham, On quasi-Mersennian numbers, Mess. Math., 41 (1912), 119-146.
Table of n, a(n) for n=1..72.
Sequence in context: A047502 A117092 A002504 * A123091 A191918 A191925
Adjacent sequences: A133428 A133429 A133430 * A133432 A133433 A133434
N. J. A. Sloane, Nov 28 2007