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 A116022 #4 Oct 04 2024 13:11:19 %S A116022 1,2,3,4,309,618,9264,43407 %N A116022 n*phi(n)*phi(phi(n)) is a palindrome. %C A116022 No further terms up to 1 million. - _Harvey P. Dale_, Oct 04 2024 %e A116022 43407*phi(43407)*phi(phi(43407)) = 6739855589376. %t A116022 Select[Range[44000],PalindromeQ[# EulerPhi[#] EulerPhi[EulerPhi[#]]]&] (* _Harvey P. Dale_, Oct 04 2024 *) %Y A116022 Cf. A115891. %K A116022 nonn,base %O A116022 1,2 %A A116022 _Giovanni Resta_, Feb 13 2006