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 A256840 #6 May 02 2017 21:45:34 %S A256840 20857,21577,21961,23761,27961,28657,29017,29761,30937,33961,34897, %T A256840 37897,41761,42937,49297,51361,60337,62761,65257,80761,83737,93097, %U A256840 107761,111337,113761,122497,132961,142537,151057,164377,173617,181537,188017,192961,218761 %N A256840 Primes of form n^2 + 20736. %C A256840 Conjecture: sequence is infinite. %H A256840 Reinhard Zumkeller, <a href="/A256840/b256840.txt">Table of n, a(n) for n = 1..10000</a> %H A256840 J. Gebel, <a href="/A001014/a001014.txt">Integer points on Mordell curves</a> [Cached copy, after the original web site tnt.math.se.tmu.ac.jp was shut down in 2017] %o A256840 (Haskell) %o A256840 a256840 n = a256840_list !! (n-1) %o A256840 a256840_list = [x | x <- map (+ 20736) a000290_list, a010051' x == 1] %Y A256840 Cf. A010051, A000290; subsequence of A028916. %Y A256840 Primes of form n^2+b^4, b fixed: A002496 (b=1), A243451 (b=2), A256775 (b=3), A256776 (b=4), A256777 (b=5), A256834 (b=6), A256835 (b=7), A256836 (b=8), A256837 (b=9), A256838 (b=10), A256839 (b=11), A256841 (b=13). %K A256840 nonn %O A256840 1,1 %A A256840 _Reinhard Zumkeller_, Apr 11 2015