1,6
Cf. A000931.
Sequence in context: A030142 A076185 A101813 this_sequence A099995 A100028 A053681
Adjacent sequences: A134716 A134717 A134718 this_sequence A134720 A134721 A134722
easy,nonn
Omar E. Pol (info(AT)polprimos.com), Nov 11 2007
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