Numbers k such that phi(k) = phi(k+2).

Terms

a(0) =4a(1) =7a(2) =8a(3) =10a(4) =26a(5) =32a(6) =70a(7) =74a(8) =122a(9) =146a(10) =308a(11) =314a(12) =386a(13) =512a(14) =554a(15) =572a(16) =626a(17) =635a(18) =728a(19) =794a(20) =842a(21) =910a(22) =914a(23) =1015a(24) =1082a(25) =1226a(26) =1322a(27) =1330a(28) =1346a(29) =1466