0,2

a(n)=Min{m|A001221(m*(m+1))=n}

n=9, a(n)=38570 since n(n+1)=(2.5.7.19.29)(3.13.23.43) a(n)<=A002110(n)-1 because A001221[(q-1)q]>=n+1.

Cf. A006549, A001221, A002110, A054989.

Sequence in context: A006847 A008286 A049082 this_sequence A102019 A097595 A081483

Adjacent sequences: A059955 A059956 A059957 this_sequence A059959 A059960 A059961

nonn

Labos E. (labos(AT)ana.sote.hu), Mar 02 2001

More terms from William Rex Marshall (w.r.marshall(AT)actrix.co.nz), Mar 18 2001