Primes p such that continued fraction of (1 + sqrt(p))/2 has period 13: primes in A333640.

Terms

a(0) =421a(1) =757a(2) =1021a(3) =1097a(4) =1117a(5) =1301a(6) =1553a(7) =1973a(8) =2069a(9) =2237a(10) =2273a(11) =2789a(12) =2861a(13) =3373a(14) =3461a(15) =3517a(16) =3877a(17) =3917a(18) =4133a(19) =4397a(20) =4481a(21) =5521a(22) =5573a(23) =5717a(24) =6221a(25) =6317a(26) =6637a(27) =6997a(28) =7253a(29) =7517