This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A161505 #10 Jul 26 2020 13:38:44
%S A161505 7,41,59,67,73,107,131,139,157,173,191,197,199,223,239,257,263,271,
%T A161505 331,337,389,397,421,461,463,487,503,521,569,587,593,601,619,653,659,
%U A161505 661,701,719,727,733,751,857,859,883,983,991,997,1031,1049,1063,1097,1123
%N A161505 Primes congruent to {1, 7, 8, 25, 26, 32} mod 33.
%C A161505 The cyclotomic polynomial Phi(33p,x) is flat only for p in this sequence.
%H A161505 Georg Fischer, <a href="/A161505/b161505.txt">Table of n, a(n) for n = 1..1000</a>
%F A161505 Union of A142049, A142053, A142054, A142063, A142064, A142068.
%t A161505 Flatten[Table[Select[33*n+{-8,-7,-1,1,7,8}, PrimeQ], {n,50}]]
%Y A161505 Cf. A117223, A142049, A142053, A142054, A142063, A142064, A142068, A160495.
%K A161505 nonn
%O A161505 1,1
%A A161505 _T. D. Noe_, Jun 17 2009
%E A161505 a(1)=7 inserted by _Georg Fischer_, Jul 26 2020