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Table of n, a(n) for n=1..39.
Solutions to Mod[ -1+2^x, x-1]=0.
Sequence in context: A053038 A001088 A101926 * A074411 A189838 A247219
Adjacent sequences: A087962 A087963 A087964 * A087966 A087967 A087968
Labos Elemer, Sep 22 2003