Numbers k such that the continued fraction for sqrt(k) has even period 2*m and the m-th term of the periodic part is 2.
A031405
Numbers k such that the continued fraction for sqrt(k) has even period 2*m and the m-th term of the periodic part is 2.
Terms
- a(0) =6a(1) =12a(2) =14a(3) =20a(4) =21a(5) =28a(6) =30a(7) =33a(8) =42a(9) =44a(10) =45a(11) =52a(12) =55a(13) =56a(14) =60a(15) =70a(16) =72a(17) =77a(18) =90a(19) =95a(20) =110a(21) =112a(22) =117a(23) =126a(24) =132a(25) =133a(26) =138a(27) =153a(28) =154a(29) =156
External references
- oeis: A031405