Primes of the form 4*k^2 + 1.

Terms

a(0) =5a(1) =17a(2) =37a(3) =101a(4) =197a(5) =257a(6) =401a(7) =577a(8) =677a(9) =1297a(10) =1601a(11) =2917a(12) =3137a(13) =4357a(14) =5477a(15) =7057a(16) =8101a(17) =8837a(18) =12101a(19) =13457a(20) =14401a(21) =15377a(22) =15877a(23) =16901a(24) =17957a(25) =21317a(26) =22501a(27) =24337a(28) =25601a(29) =28901