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 A056187 #32 Aug 15 2019 06:48:57 %S A056187 2,5,31,283,3,67,11,11,5,173,3,1237,7,31,7334881,227,3,773,149,47,11, %T A056187 5,3,101,13,73,151,349,3,4421,107,191,17,7,3,17,19,624808693,2273, %U A056187 25788481,3,5,59,1752761753,23,2144707,3,49547,5,275851515609829434269,19,919,3,13,7,107,29 %N A056187 Least prime factor of n^n + (n+1)^(n+1). %H A056187 Hugo Pfoertner, <a href="/A056187/b056187.txt">Table of n, a(n) for n = 0..234</a>, (first 96 terms from Chai Wah Wu). %H A056187 factordb.com, <a href="http://factordb.com/index.php?query=235%5E235%2B236%5E236">Status of 235^235+236^236</a>. %H A056187 Walter Nissen, <a href="http://upforthecount.com/math/nnpomega.html">np(n) = n^n + (n+1)^(n+1) -- 2 prominent questions</a>. (Updated Oct 02 2012) %F A056187 a(n) = A020639(A056788(n+1)). - _M. F. Hasler_, Oct 04 2012 %e A056187 a(5) = 67 because 5^5 + 6^6 = 3125 + 46656 = 67 * 743. %o A056187 (PARI) A056187(n)=factor((n+1)^(n+1)+n^n)[1,1] \\ _M. F. Hasler_, Oct 04 2012 %Y A056187 Cf. A056788, A056790, A192397, A217435. %K A056187 nonn %O A056187 0,1 %A A056187 _Walter Nissen_, Aug 20 2000 %E A056187 2 added by _Arkadiusz Wesolowski_, Jun 30 2011 %E A056187 a(53)-a(56) from _Chai Wah Wu_, Jul 22 2019