Numbers k such that m=2*k is the middle side in a Heronian triangle with sides m-13, m , m+13.

Terms

a(0) =13a(1) =14a(2) =19a(3) =26a(4) =37a(5) =62a(6) =91a(7) =134a(8) =229a(9) =338a(10) =499a(11) =854a(12) =1261a(13) =1862a(14) =3187a(15) =4706a(16) =6949a(17) =11894a(18) =17563a(19) =25934a(20) =44389a(21) =65546a(22) =96787a(23) =165662a(24) =244621a(25) =361214a(26) =618259a(27) =912938a(28) =1348069a(29) =2307374