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 A256776 Primes of form n^2 + 256. 14
 257, 281, 337, 617, 881, 1097, 1217, 1481, 1777, 2281, 2657, 2857, 4481, 5297, 5881, 7481, 8537, 9281, 10457, 12577, 14897, 15881, 17417, 18481, 19577, 23057, 24281, 25537, 26177, 27481, 28817, 30881, 32297, 35977, 38281, 39857, 42281, 44777, 52697, 53617 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Conjecture: sequence is infinite. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 PROG (Haskell) a256776 n = a256776_list !! (n-1) a256776_list = [x | x <- map (+ 256) a000290_list, a010051' x == 1] (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 CROSSREFS Cf. A010051, A000290; subsequence of A028916. 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). Sequence in context: A060879 A062382 A289560 * A252279 A105345 A060261 Adjacent sequences:  A256773 A256774 A256775 * A256777 A256778 A256779 KEYWORD nonn AUTHOR Reinhard Zumkeller, Apr 11 2015 STATUS approved

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Last modified April 11 00:03 EDT 2021. Contains 342877 sequences. (Running on oeis4.)