a(n) = sum{k=1 to n} binomial(n,k) * GCD(k,n).
1, 4, 9, 24, 35, 138, 133, 528, 855, 2550, 2057, 12708, 8203, 45178, 78645, 182816
2 seqfan posts
Tue Apr 14 23:04:24 CEST 2009 [seqfan] Re: When n^2 divides sum
Tue Apr 14 22:42:27 CEST 2009 [seqfan] When n^2 divides sum
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
Links to OEIS content are included according to
The OEIS End-User License Agreement
.