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R. K. Guy, Unsolved Problems in Number Theory, E16.
Table of n, a(n) for n=0..48.
Sequence in context: A050662 A236180 A033410 * A161823 A270173 A003899
Adjacent sequences: A008898 A008899 A008900 * A008902 A008903 A008904
N. J. A. Sloane.