Primes of the form k^2 + 1.

Terms

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