0,1
R. K. Guy, Unsolved Problems in Number Theory, E16.
Adjacent sequences: A008898 A008899 A008900 this_sequence A008902 A008903 A008904
Sequence in context: A052999 A050662 A033410 this_sequence A161823 A012861 A003899
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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