Seqfans: > %S A081650 2,5,13,73,409,801,1584,2241,30601,30601,78409,156825, ... > %N A081650 Least nonsquare congruent to i^2 (mod k^2) for all 0<k<=n, > i being any integer. > %O A081650 1,1 Why is a(4)=73, instead of 52? -- don r djr at .nk.ca