Numbers k such that 11^phi(k) == 1 (mod k^2), where phi(k) = A000010(k).

Terms

a(0) =71a(1) =142a(2) =284a(3) =355a(4) =497a(5) =710a(6) =994a(7) =1420a(8) =1491a(9) =1988a(10) =2485a(11) =2840a(12) =2982a(13) =3976a(14) =4970a(15) =5680a(16) =5964a(17) =7455a(18) =9940a(19) =11928a(20) =14910a(21) =19880a(22) =23856a(23) =29820a(24) =39760a(25) =59640a(26) =79520a(27) =119280a(28) =238560a(29) =477120