Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
1,2
a(n) = n*A020639(n)/A006530(n) = A052126(n)*A020639(n);
a(n)<=n; a(n)=n iff n is a prime power: a(A000961(n))=A000961(n);
a(A001221(n)) <= A001221(n); a(A001222(n)) = A001222(n);
a(n) = A130064(n)-n*A046665(n)*A074320(n)/A066048(n) = A000290(n)/A130064(n).
R. Zumkeller, Table of n, a(n) for n = 1..10000
Sequence in context: A119816 A227538 A068794 * A079881 A058084 A074882
Adjacent sequences: A130062 A130063 A130064 * A130066 A130067 A130068
nonn
Reinhard Zumkeller, May 05 2007
approved