1,1
Cf. A000040, A000720, A141042, A152535.
Sequence in context: A011433 A126139 A060872 this_sequence A066959 A086471 A097505
Adjacent sequences: A162772 A162773 A162774 this_sequence A162776 A162777 A162778
easy,more,nonn
Omar E. Pol (info(AT)polprimos.com), Jul 30 2009
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