0,1
R. K. Guy, Unsolved Problems in Number Theory, E16.
Sequence in context: A056770 A061038 A058231 this_sequence A033973 A033356 A158955
Adjacent sequences: A008891 A008892 A008893 this_sequence A008895 A008896 A008897
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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