1,1
Cf. A050642, A048566, A050649.
Sequence in context: A012630 A013173 A013147 this_sequence A145513 A002860 A108078
Adjacent sequences: A050640 A050641 A050642 this_sequence A050644 A050645 A050646
nonn,base,more
Patrick De Geest (pdg(AT)worldofnumbers.com), Jul 15 1999.
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