Numbers k such that sigma(k)-k = pi(sigma(k)).

A090999

Numbers k such that sigma(k)-k = pi(sigma(k)).

Terms

    a(0) =1a(1) =15a(2) =21a(3) =33a(4) =23069a(5) =42029a(6) =148031a(7) =209911a(8) =3271099

External references