a(n) is the smallest prime such that it and the previous three primes are all of the form x^2 + n * y^2.
A212604
a(n) is the smallest prime such that it and the previous three primes are all of the form x^2 + n * y^2.
Terms
- a(0) =409a(1) =577a(2) =1759a(3) =409a(4) =55049a(5) =1783a(6) =127a(7) =20873a(8) =12889a(9) =6529a(10) =4943a(11) =12889a(12) =3461a(13) =138041a(14) =46411a(15) =20873a(16) =115013a(17) =7417a(18) =4919a(19) =158209a(20) =8490721a(21) =7177a(22) =15787a(23) =4967401a(24) =55049a(25) =383393a(26) =76597a(27) =5273a(28) =252541a(29) =10448401
External references
- oeis: A212604