Numbers k such that Sum_(i=1..k) prime(i)*(-1)^(i+1) is a square.

Terms

a(0) =3a(1) =9a(2) =55a(3) =181a(4) =215a(5) =459a(6) =1361a(7) =1417a(8) =1623a(9) =2047a(10) =2445a(11) =4685a(12) =6687a(13) =7353a(14) =7785a(15) =7925a(16) =8489a(17) =10333a(18) =10515a(19) =11179a(20) =14087a(21) =15227a(22) =15829