1,3
Cf. A000110.
Sequence in context: A120602 A004130 A088869 this_sequence A053918 A053926 A112273
Adjacent sequences: A134712 A134713 A134714 this_sequence A134716 A134717 A134718
easy,nonn
Omar E. Pol (info(AT)polprimos.com), Nov 11 2007
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