k^2 is a term if k^2 + (k-1)^2 and k^2 + (k+1)^2 are primes.

Terms

a(0) =4a(1) =25a(2) =625a(3) =900a(4) =1225a(5) =4900a(6) =7225a(7) =10000a(8) =12100a(9) =50625a(10) =52900a(11) =67600a(12) =81225a(13) =84100a(14) =102400a(15) =152100a(16) =168100a(17) =225625a(18) =240100a(19) =245025a(20) =265225a(21) =348100a(22) =462400a(23) =483025a(24) =504100a(25) =562500a(26) =577600a(27) =714025a(28) =902500a(29) =1166400