11862197domain: NAppears in sequencesIndices of records in A159918.at n=34A230097a(n) = smallest m such that wt(m^2) = n (where wt(i) = A000120(i)), or -1 if no such m exists.at n=39A231897a(n) is the least k such that B(k^2) - B(k) = n, where B(m) is the binary weight A000120(m).at n=29A357750