Smallest semiprime containing exactly n 7's.

A104760

Smallest semiprime containing exactly n 7's.

Terms

    a(0) =57a(1) =77a(2) =3777a(3) =17777a(4) =277777a(5) =1777777a(6) =17777777a(7) =707777777a(8) =3777777777a(9) =17777777777a(10) =577777777777

External references