Primes in the concatenation n^2, n and 1.

Terms

a(0) =421a(1) =2551a(2) =6481a(3) =8191a(4) =289171a(5) =729271a(6) =1024321a(7) =1521391a(8) =1681411a(9) =3136561a(10) =3600601a(11) =4225651a(12) =4356661a(13) =4624681a(14) =5184721a(15) =6084781a(16) =7921891a(17) =9604981a(18) =116641081a(19) =136891171a(20) =144001201a(21) =163841281a(22) =174241321