Numbers k such that k^2 divides 11^k - 1.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =6a(5) =10a(6) =12a(7) =20a(8) =30a(9) =42a(10) =60a(11) =84a(12) =114a(13) =156a(14) =210a(15) =222a(16) =228a(17) =244a(18) =420a(19) =444a(20) =570a(21) =732a(22) =780a(23) =798a(24) =930a(25) =1092a(26) =1110a(27) =1140a(28) =1220a(29) =1554