0,1
R. K. Guy, Unsolved Problems in Number Theory, E16.
Sequence in context: A065012 A033253 A141933 this_sequence A159071 A023284 A142025
Adjacent sequences: A008894 A008895 A008896 this_sequence A008898 A008899 A008900
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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