Numbers k such that phi(k) = phi(k+1).

Terms

a(0) =1a(1) =3a(2) =15a(3) =104a(4) =164a(5) =194a(6) =255a(7) =495a(8) =584a(9) =975a(10) =2204a(11) =2625a(12) =2834a(13) =3255a(14) =3705a(15) =5186a(16) =5187a(17) =10604a(18) =11715a(19) =13365a(20) =18315a(21) =22935a(22) =25545a(23) =32864a(24) =38804a(25) =39524a(26) =46215a(27) =48704a(28) =49215a(29) =49335