53607domain: NAppears in sequencesIntegers of the form 8k+7 that can be written as a sum of four distinct squares of the form m, m+2, m+4, m+5, where m == 1 (mod 4).at n=28A243579G.f.: 1 / AGM(1-5*x+x^2, 1+3*x+x^2).at n=9A246652