Numbers k such that phi(k) = phi(sigma(k)).

Terms

a(0) =1a(1) =3a(2) =15a(3) =26a(4) =39a(5) =45a(6) =74a(7) =104a(8) =111a(9) =117a(10) =122a(11) =146a(12) =175a(13) =183a(14) =195a(15) =219a(16) =296a(17) =314a(18) =333a(19) =357a(20) =386a(21) =471a(22) =488a(23) =549a(24) =554a(25) =555a(26) =579a(27) =584a(28) =585a(29) =608