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 A253914 #11 Apr 28 2019 20:08:32 %S A253914 6,18,20,30,66,258,260,732,1026,3130,4098,4100,16386,19686,46662, %T A253914 65538,65540,65552,262146,531444,823550,1048578,1048580,4194306, %U A253914 9765630,14348910,16777218,16777220,16777224,67108866,268435458,268435460,387420492,387420498,1073741826 %N A253914 Numbers that can be represented as both a^x + x and b^y + b, for some a, b, x, y > 1. %C A253914 Intersection of A099225 and A253913. %C A253914 Includes a^(a*b)+a = (a^b)^a+a for a,b > 1. - _Robert Israel_, Apr 28 2019 %e A253914 a(1) = 6 = 2^2 + 2, in this case a = b = x = y = 2. %e A253914 a(2) = 18 = 2^4 + 2 = 4^2 + 2. %e A253914 a(8) = 732 = 3^6 + 3 = 9^3 + 3. %Y A253914 Cf. A099225, A253913, A099226. %K A253914 nonn %O A253914 1,1 %A A253914 _Alex Ratushnyak_, Jan 18 2015