Length of period of the continued fraction expansion of sqrt(2^n+1).

Terms

a(0) =1a(1) =4a(2) =1a(3) =10a(4) =1a(5) =16a(6) =1a(7) =44a(8) =1a(9) =74a(10) =1a(11) =46a(12) =1a(13) =204a(14) =1a(15) =714a(16) =1a(17) =702a(18) =1a(19) =908a(20) =1a(21) =404a(22) =1a(23) =7754a(24) =1a(25) =1136a(26) =1a(27) =9886a(28) =1a(29) =8154