Primes p of the form k^2 + 1 such that p+2 and 2p+1 are also prime.

Terms

a(0) =5a(1) =25601a(2) =193601a(3) =1144901a(4) =1464101a(5) =4326401a(6) =6100901a(7) =12390401a(8) =23522501a(9) =72931601a(10) =127012901a(11) =245862401a(12) =256960901a(13) =351937601a(14) =441840401a(15) =732784901a(16) =802588901a(17) =951722501a(18) =1621672901a(19) =2024100101a(20) =2070250001a(21) =2217468101a(22) =2219352101a(23) =2428518401a(24) =2930056901a(25) =2963713601