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 A295740 #34 May 31 2020 17:39:06 %S A295740 190213279479817426,283959621257123566,301971651496560046, %T A295740 575203724324614126,800951203404568126,849341919686285026, %U A295740 1118572636403947726,2080713636347910526,2270517620327541586,2767984602684877486,5013069719001987826,5133266340887464066,5252931629341901506,5743747078662858526 %N A295740 Even pseudoprimes (A006935) that are not squarefree. %C A295740 For a prime p, if p^2 divides an even pseudoprime, then p is a Wieferich prime (A001220) and A007733(p)=A002326((p-1)/2) is odd. Currently, the only known such prime is p=3511. %C A295740 So, all known terms are multiples of 3511^2. Furthermore, no term can be a multiple of 3511^3. %H A295740 Max Alekseyev, <a href="/A295740/b295740.txt">Table of n, a(n) for n = 1..80</a> (5 wrong terms were removed by _Mauro Fiorentini_, May 31 2020) %e A295740 a(1) = 190213279479817426 = 2 * 7 * 79 * 1951 * 3511^2 * 7151. %e A295740 a(2) = 283959621257123566 = 2 * 599 * 937 * 3511^2 * 20521. %e A295740 a(3) = 301971651496560046 = 2 * 31 * 71 * 73 * 3511^2 * 76231. %Y A295740 Intersection of A006935 and A013929. %Y A295740 The even terms of A158358. Also, unless there is a Wieferich prime greater than 3511, the even terms of A247831. %K A295740 nonn %O A295740 1,1 %A A295740 _Max Alekseyev_, Nov 26 2017