Numbers k such that k and uphi(k) have the same set of prime divisors, where uphi is the unitary totient function (A047994).

A329859

Numbers k such that k and uphi(k) have the same set of prime divisors, where uphi is the unitary totient function (A047994).

Terms

    a(0) =1a(1) =12a(2) =36a(3) =168a(4) =240a(5) =504a(6) =702a(7) =720a(8) =1176a(9) =1200a(10) =1344a(11) =1404a(12) =1620a(13) =3528a(14) =3600a(15) =4032a(16) =4050a(17) =6480a(18) =8100a(19) =9408a(20) =14880a(21) =19656a(22) =22680a(23) =23250a(24) =28080a(25) =28224a(26) =32400a(27) =44640a(28) =46500a(29) =53460

External references