a(n) = smallest k such that (10^k-1)/9 == 0 mod prime(n)^2, or 0 if no such k exists.

Terms

a(0) =0a(1) =9a(2) =0a(3) =42a(4) =22a(5) =78a(6) =272a(7) =342a(8) =506a(9) =812a(10) =465a(11) =111a(12) =205a(13) =903a(14) =2162a(15) =689a(16) =3422a(17) =3660a(18) =2211a(19) =2485a(20) =584a(21) =1027a(22) =3403a(23) =3916a(24) =9312a(25) =404a(26) =3502a(27) =5671a(28) =11772a(29) =12656