Prime(a(n)) + ... + prime(a(n)+3) is a square = A051395(n)^2.

Terms

a(0) =3a(1) =21a(2) =33a(3) =84a(4) =104a(5) =199a(6) =689a(7) =1848a(8) =1923a(9) =3435a(10) =3795a(11) =3985a(12) =4126a(13) =4742a(14) =5968a(15) =6413a(16) =6495a(17) =7649a(18) =8927a(19) =9906a(20) =16885a(21) =17677a(22) =20474a(23) =20996a(24) =22924a(25) =23923a(26) =36902a(27) =38733a(28) =40347a(29) =40654