65574domain: NAppears in sequencesG.f.: -1 + Product_{k>=1} (1 + prime(k)*x^prime(k)).at n=42A002099a(n) is the greatest integer k such that k/Fibonacci(n) < sqrt(2).at n=24A293418a(n) is the integer k that minimizes |k/Fibonacci(n) - sqrt(2)|.at n=24A293420a(n) = Sum_{k=1..n} 4^(gcd(k, n) - 1).at n=8A343490