67172domain: NAppears in sequencesNumbers x such that sigma(x)=sigma(V(x)), where sigma(x) is the sum of the divisors of x and V(x) the transform defined in A245252.at n=19A245469Number of sets of exactly n positive integers <= n+7 having a square element sum.at n=24A281970a(n) = Sum_{k=1..n} k^(n/gcd(k,n) - 1).at n=6A342396