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,...].
A229958
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) =3a(3) =1a(4) =10a(5) =42a(6) =330a(7) =11a(8) =1a(9) =17a(10) =110a(11) =2a(12) =219962a(13) =910a(14) =42a(15) =1a(16) =26a(17) =15a(18) =6162806a(19) =110a(20) =371795a(21) =933478a(22) =510a(23) =255a(24) =1a(25) =37a(26) =462a(27) =28985a(28) =1329410a(29) =39
External references
- oeis: A229958