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 4.
A031407
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 4.
Terms
- a(0) =18a(1) =22a(2) =34a(3) =39a(4) =57a(5) =68a(6) =69a(7) =76a(8) =78a(9) =92a(10) =105a(11) =108a(12) =116a(13) =124a(14) =140a(15) =150a(16) =155a(17) =174a(18) =186a(19) =203a(20) =205a(21) =217a(22) =220a(23) =259a(24) =264a(25) =266a(26) =282a(27) =294a(28) =301a(29) =308
External references
- oeis: A031407