Primes of the form n^2 + 1 such that (n - 1)^2 + 1 and (n + 1)^2 + 1 are semiprimes.

Terms

a(0) =17a(1) =101a(2) =28901a(3) =324901a(4) =608401a(5) =902501a(6) =2016401a(7) =5664401a(8) =7452901a(9) =14822501a(10) =16974401a(11) =18490001a(12) =34222501a(13) =40449601a(14) =41731601a(15) =46240001a(16) =48580901a(17) =50410001a(18) =52417601a(19) =76038401a(20) =92736901a(21) =103022501a(22) =111936401a(23) =121220101a(24) =124768901a(25) =139948901a(26) =151290001