Positive integers n such that 2^n == 4 (mod n).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =10a(5) =12a(6) =14a(7) =22a(8) =26a(9) =30a(10) =34a(11) =38a(12) =46a(13) =58a(14) =62a(15) =74a(16) =82a(17) =86a(18) =94a(19) =106a(20) =118a(21) =122a(22) =132a(23) =134a(24) =142a(25) =146a(26) =158a(27) =166a(28) =170a(29) =178