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 A084046 #9 Jul 29 2017 13:33:32 %S A084046 2,2,5,0,1019,15619,2799359999993,6553,503,16679880978191, %T A084046 8293509467471861,244140613,8179,152736582765019941952958691637187, %U A084046 5097655355238390956017,0,18909044154723310956357640154206945542127 %N A084046 Smallest prime p such that p + n is an n-th power, or 0 if no such number exists. I.e., smallest prime of the form k^n - n. %C A084046 a(4n^2) = 0. Conjecture: if a(k) = 0 then k is an even square. %e A084046 a(5) = 1019 as 1019 + 5 = 1024 = 4^5. %Y A084046 Cf. A084047. %K A084046 base,nonn %O A084046 1,1 %A A084046 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 26 2003 %E A084046 More terms from _Ray Chandler_, Jun 16 2003