163712domain: NAppears in sequencesT(n, 2*n-5), T given by A027960.at n=26A027967Numbers k such that k | phi(k)*d(k) - sigma(k), where phi=A000010, d=A000005 and sigma=A000203.at n=7A055650Expansion of Product_{k>=1} ((1 + x^(4*k)) / (1 - x^k)).at n=44A285472