Number of positive integers with n digits and final digit 9 that are equal to the product of two integers ending with the same digit.

A348547

Number of positive integers with n digits and final digit 9 that are equal to the product of two integers ending with the same digit.

Terms

    a(0) =1a(1) =4a(2) =49a(3) =524a(4) =5596a(5) =58706a(6) =608886a(7) =6267854a(8) =64180304a(9) =654605898a(10) =6656849267a(11) =67539297095a(12) =683989985496

External references