5,2
H. T. Croft, K. J. Falconer and R. K. Guy, Unsolved Problems in Geometry, B15.
Adjacent sequences: A005838 A005839 A005840 this_sequence A005842 A005843 A005844
Sequence in context: A005046 A141827 A143077 this_sequence A005828 A084764 A061789
nonn,hard,nice
njas
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