Least x = a(n) such that number of common prime factors (ignoring multiplicity) of sigma(x) = A000203(x) and phi(x) = A000010(x) equals n.
A081383
Least x = a(n) such that number of common prime factors (ignoring multiplicity) of sigma(x) = A000203(x) and phi(x) = A000010(x) equals n.
Terms
- a(0) =3a(1) =14a(2) =209a(3) =3596a(4) =41624a(5) =2003639a(6) =24206049a(7) =2562857198a(8) =57721363052
External references
- oeis: A081383