Number of n-digit semiprimes whose prime factors concatenated larger to the right of smaller form an n-digit prime (in decimal).

A259493

Number of n-digit semiprimes whose prime factors concatenated larger to the right of smaller form an n-digit prime (in decimal).

Terms

    a(0) =0a(1) =1a(2) =21a(3) =148a(4) =1078a(5) =7898a(6) =60843a(7) =486390a(8) =3969956a(9) =33123937a(10) =280486145a(11) =2411806083

External references