Least m>0 for which m + n^2 is a square and m + triangular(n) is a triangular number (A000217).

Terms

a(0) =1a(1) =35a(2) =12a(3) =72a(4) =180a(5) =336a(6) =45a(7) =792a(8) =1092a(9) =208a(10) =1836a(11) =2280a(12) =112a(13) =315a(14) =3900a(15) =4536a(16) =644a(17) =5952a(18) =6732a(19) =7560a(20) =225a(21) =715a(22) =10332a(23) =627a(24) =12420a(25) =13536a(26) =924a(27) =1575a(28) =17172a(29) =840