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 A256776 #6 Aug 18 2017 10:49:13 %S A256776 257,281,337,617,881,1097,1217,1481,1777,2281,2657,2857,4481,5297, %T A256776 5881,7481,8537,9281,10457,12577,14897,15881,17417,18481,19577,23057, %U A256776 24281,25537,26177,27481,28817,30881,32297,35977,38281,39857,42281,44777,52697,53617 %N A256776 Primes of form n^2 + 256. %C A256776 Conjecture: sequence is infinite. %H A256776 Reinhard Zumkeller, <a href="/A256776/b256776.txt">Table of n, a(n) for n = 1..10000</a> %o A256776 (Haskell) %o A256776 a256776 n = a256776_list !! (n-1) %o A256776 a256776_list = [x | x <- map (+ 256) a000290_list, a010051' x == 1] %o A256776 (PARI) list(lim)=if(lim<257,return([])); my(v=List(),t); forstep(n=1, sqrtint(lim\1-256), 2, if(isprime(t=n^2+256), listput(v,t))); Vec(v) \\ _Charles R Greathouse IV_, Aug 18 2017 %Y A256776 Cf. A010051, A000290; subsequence of A028916. %Y A256776 Primes of form n^2+b^4, b fixed: A002496 (b=1), A243451 (b=2), A256775 (b=3), A256777 (b=5), A256834 (b=6), A256835 (b=7), A256836 (b=8), A256837 (b=9), A256838 (b=10), A256839 (b=11), A256840 (b=12), A256841 (b=13). %K A256776 nonn %O A256776 1,1 %A A256776 _Reinhard Zumkeller_, Apr 11 2015