1,3
Cf. A001006.
Sequence in context: A135187 A133762 A118130 this_sequence A127989 A020290 A020288
Adjacent sequences: A134714 A134715 A134716 this_sequence A134718 A134719 A134720
easy,nonn
Omar E. Pol (info(AT)polprimos.com), Nov 11 2007
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