a(n) is the smallest positive number k coprime to (2n+1)!! such that (2n+1)!! + k^2 is a square.
A348635
a(n) is the smallest positive number k coprime to (2n+1)!! such that (2n+1)!! + k^2 is a square.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =4a(4) =29a(5) =17a(6) =436a(7) =356a(8) =569a(9) =1847a(10) =27704a(11) =72944a(12) =1283333a(13) =726079a(14) =23833532a(15) =45232276a(16) =302068799a(17) =616565857a(18) =26369361188a(19) =23157514888a(20) =70991664061a(21) =505527042479
External references
- oeis: A348635