Numbers k such that gcd(sigma(k), phi(k)) (A009223) attains record values.

Terms

a(0) =1a(1) =3a(2) =12a(3) =14a(4) =15a(5) =35a(6) =105a(7) =190a(8) =248a(9) =357a(10) =616a(11) =812a(12) =1045a(13) =3080a(14) =3135a(15) =3339a(16) =4064a(17) =5049a(18) =8323a(19) =8636a(20) =10659a(21) =12441a(22) =16065a(23) =19780a(24) =20026a(25) =23374a(26) =24871a(27) =29029a(28) =50065a(29) =58435