117739domain: NAppears in sequencesNonprimes in A078447.at n=13A078877Values of n such that the expression sqrt(4!*(n+1) + 1) yields a perfect power.at n=15A144854Composite numbers k such that Pell(k) == -1 (mod k).at n=9A319043Numbers n for which A326073(n) is equal to abs(1+A326146(n)).at n=24A326074