Numbers k such that k+x+y is a square, where x and y are the two squares nearest to k.

Terms

a(0) =0a(1) =4a(2) =11a(3) =23a(4) =56a(5) =80a(6) =103a(7) =135a(8) =204a(9) =248a(10) =339a(11) =395a(12) =444a(13) =508a(14) =576a(15) =635a(16) =711a(17) =860a(18) =948a(19) =1119a(20) =1219a(21) =1304a(22) =1412a(23) =1619a(24) =1739a(25) =1968a(26) =2100a(27) =2211a(28) =2351a(29) =2495