0,1
R. K. Guy, Unsolved Problems in Number Theory, E16.
Sequence in context: A145821 A142655 A140040 this_sequence A142393 A142045 A142936
Adjacent sequences: A008897 A008898 A008899 this_sequence A008901 A008902 A008903
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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