2,1
Cf. A060437
Sequence in context: A046219 A088978 A160245 * A112753 A023589 A134034
Adjacent sequences: A154348 A154349 A154350 * A154352 A154353 A154354
easy,nonn
Naohiro Nomoto (fwqfg726(AT)ybb.ne.jp), Jan 07 2009