76450domain: NAppears in sequencesa(n) = (7*n+2)*(7*n+5) = 49*n^2 + 49*n + 10.at n=39A177060Larger of amicable pair m < n defined by t(n) = m and t(m) = n where t(n) = psi(n) - n and psi(n) = A001615(n) is the Dedekind psi function.at n=29A323330E.g.f. A(x) satisfies A(x) = 1/( 1 - x * A(x) * cos(x * A(x)) )^2.at n=5A381480