1,1
Cf. A068665, A068666, A068667, A068972, A068973, A068974.
Adjacent sequences: A068968 A068969 A068970 this_sequence A068972 A068973 A068974
Sequence in context: A122946 A087628 A089871 this_sequence A019233 A121223 A139518
nonn,base,hard
Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 30 2002.
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