Numbers k such that the root-mean-square value of 1, 2, ..., k, i.e., sqrt((1/k)*Sum_{j=1..k} j^2), is an integer.
A084231
Numbers k such that the root-mean-square value of 1, 2, ..., k, i.e., sqrt((1/k)*Sum_{j=1..k} j^2), is an integer.
Terms
- a(0) =1a(1) =337a(2) =65521a(3) =12710881a(4) =2465845537a(5) =478361323441
External references
- oeis: A084231