Primes p of the form 420k + 1 for some k.

Terms

a(0) =421a(1) =2521a(2) =3361a(3) =4201a(4) =4621a(5) =5881a(6) =6301a(7) =7561a(8) =8821a(9) =9241a(10) =9661a(11) =10501a(12) =12601a(13) =13441a(14) =14281a(15) =15121a(16) =15541a(17) =16381a(18) =18061a(19) =18481a(20) =20161a(21) =21001a(22) =21841a(23) =24781a(24) =25621a(25) =26041a(26) =26881a(27) =29401a(28) =30241a(29) =30661