Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 13.
A031511
Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 13.
Terms
- a(0) =171a(1) =179a(2) =187a(3) =191a(4) =199a(5) =211a(6) =223a(7) =680a(8) =704a(9) =768a(10) =800a(11) =808a(12) =832a(13) =864a(14) =872a(15) =896a(16) =1527a(17) =1587a(18) =1671a(19) =1815a(20) =1875a(21) =1959a(22) =2019a(23) =2712a(24) =2776a(25) =2824a(26) =3032a(27) =3208a(28) =3288a(29) =3352
External references
- oeis: A031511