Composite solutions of the form 4k+3 of the equation (*): sigma(phi(sigma(x)))=phi(sigma(phi(x))).

A112017

Composite solutions of the form 4k+3 of the equation (*): sigma(phi(sigma(x)))=phi(sigma(phi(x))).

Terms

    a(0) =1843a(1) =2231a(2) =12707a(3) =20003a(4) =58091a(5) =72971a(6) =129899a(7) =153851a(8) =876987a(9) =899991a(10) =909131a(11) =1154535a(12) =1660931a(13) =1835503a(14) =2003303a(15) =2184463a(16) =2200979a(17) =2248307a(18) =2482667a(19) =2518571a(20) =2566463a(21) =2699723a(22) =2978371a(23) =2982815a(24) =3537163a(25) =4814207a(26) =4831439

External references