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 A292552 #44 Jul 19 2024 04:35:02 %S A292552 98,998,9998,99998,999998,9999998,99999998,999999998,9999999998, %T A292552 99999999998,999999999998,9999999999998,99999999999998, %U A292552 999999999999998,9999999999999998,99999999999999998,999999999999999998,9999999999999999998,99999999999999999998 %N A292552 Nontotients of the form 10^k - 2. %C A292552 There are no k for which (2^n)*(5^n)[p1*p2*...*pk]-2[p1*p2*...*pk]=m[(p1-1)*(p2-1)*...*(pk-1)]. %C A292552 Up to k = 60, the only totient of the form 10^k-2 is obtained for k=1. - _Giovanni Resta_, Sep 20 2017 %C A292552 For 10^k-2 with k > 1 to be a totient, it would have to be of the form (p-1)*p^m for some odd prime p and m >= 2. - _Robert Israel_, Sep 20 2017 %e A292552 a(1) = A011557(2) - 2 = A005277(13); %e A292552 a(2) = A011557(3) - 2 = A005277(210); %e A292552 a(3) = A011557(4) - 2 = A005277(2627); %e A292552 a(4) = A011557(5) - 2 = A005277(29747). %Y A292552 Cf. A005277, A011557, A099150. %K A292552 nonn %O A292552 1,1 %A A292552 _Torlach Rush_, Sep 18 2017 %E A292552 More terms from _Giovanni Resta_, Sep 20 2017