Least k such that prime(n) is the smallest prime p for which k^2 + p^2 is also prime, or 0 if none.

Terms

a(0) =1a(1) =2a(2) =4a(3) =12a(4) =14a(5) =48a(6) =178a(7) =44a(8) =152a(9) =66a(10) =224a(11) =272a(12) =496a(13) =322a(14) =408a(15) =2068a(16) =114a(17) =354a(18) =592a(19) =584a(20) =3192a(21) =406a(22) =2708a(23) =774a(24) =2658a(25) =394a(26) =4102a(27) =2432a(28) =3346a(29) =2562