0,3
R. K. Guy, Unsolved Problems in Number Theory, Section D3.
Cf. A047694.
Sequence in context: A088994 A141598 A071599 this_sequence A093842 A050971 A118855
Adjacent sequences: A047692 A047693 A047694 this_sequence A047696 A047697 A047698
nonn,fini,full,nice
N. J. A. Sloane (njas(AT)research.att.com).
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