2,1
See A106039 for definition and link.
Sequence in context: A089601 A043072 A121717 this_sequence A007089 A136820 A136810
Adjacent sequences: A106515 A106516 A106517 this_sequence A106519 A106520 A106521
base,easy,nonn
Eric Angelini (eric.angelini(AT)kntv.be), Jun 07 2005
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