Least number x such that gcd(phi(x), sigma(x)) = n.

Terms

a(0) =1a(1) =3a(2) =18a(3) =12a(4) =200a(5) =14a(6) =3364a(7) =15a(8) =722a(9) =328a(10) =9801a(11) =42a(12) =25281a(13) =116a(14) =1800a(15) =165a(16) =36992a(17) =810a(18) =4414201a(19) =88a(20) =196a(21) =29161a(22) =541696a(23) =35a(24) =2928200a(25) =1413a(26) =103968a(27) =172a(28) =98942809a(29) =488