a(n) is the number m such that f(sqrt(n)) is in the field Q(sqrt(m)), where f(x) is defined from the continued fraction x = [c(0), c(1), ... ] as [c(0)^2, c(1)^2, ...].
A229959
a(n) is the number m such that f(sqrt(n)) is in the field Q(sqrt(m)), where f(x) is defined from the continued fraction x = [c(0), c(1), ... ] as [c(0)^2, c(1)^2, ...].
Terms
- a(0) =1a(1) =5a(2) =2a(3) =1a(4) =65a(5) =17a(6) =3a(7) =5a(8) =1a(9) =13a(10) =82a(11) =37a(12) =346a(13) =798a(14) =10a(15) =1a(16) =41a(17) =257a(18) =72829155a(19) =65a(20) =4238a(21) =269a(22) =3a(23) =17a(24) =1a(25) =2501a(26) =626a(27) =2039422a(28) =2522a(29) =101
External references
- oeis: A229959