Numbers k such that uphi(usigma(k)) = k where usigma is the sum of unitary divisors of k (A034448) and uphi is the unitary totient function (A047994).

A329855

Numbers k such that uphi(usigma(k)) = k where usigma is the sum of unitary divisors of k (A034448) and uphi is the unitary totient function (A047994).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =7a(6) =8a(7) =12a(8) =14a(9) =16a(10) =24a(11) =28a(12) =31a(13) =48a(14) =56a(15) =62a(16) =112a(17) =124a(18) =127a(19) =248a(20) =254a(21) =256a(22) =496a(23) =508a(24) =768a(25) =1016a(26) =1792a(27) =2032a(28) =7936a(29) =8191

External references