0,1
R. K. Guy, Unsolved Problems in Number Theory, E16.
Sequence in context: A044431 A044812 A125820 this_sequence A008882 A156757 A027579
Adjacent sequences: A008899 A008900 A008901 this_sequence A008903 A008904 A008905
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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