|
%I #19 Oct 27 2023 08:20:25
%S 1,2,4,6,10,30,70,510,2590,131070,3359230,167247870,8589934590,
%T 13985925344264190
%N Numbers n such that phi(n) divides n+2.
%C Contains 2 * A203966 as a subsequence. - _Max Alekseyev_, Oct 27 2023
%t Select[Range[50000000],Divisible[#+2,EulerPhi[#]]&]
%Y Cf. A000010, A050474, A207574, A202855, A203966.
%K nonn,more,hard
%O 1,2
%A _José María Grau Ribas_, Feb 19 2012
%E a(12)-a(13) from _Donovan Johnson_, Mar 01 2012
%E a(14) from _Max Alekseyev_, Oct 27 2023
|
