Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 2.
A031415
Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 2.
Terms
- a(0) =41a(1) =61a(2) =113a(3) =130a(4) =181a(5) =202a(6) =265a(7) =269a(8) =313a(9) =317a(10) =394a(11) =421a(12) =458a(13) =586a(14) =613a(15) =617a(16) =685a(17) =697a(18) =761a(19) =773a(20) =853a(21) =925a(22) =929a(23) =937a(24) =986a(25) =1013a(26) =1066a(27) =1109a(28) =1117a(29) =1201
External references
- oeis: A031415