a(n) is the smallest positive integer k such that k*R_n has digits with alternating parity, where R_n is the n-th repunit.
A391473
a(n) is the smallest positive integer k such that k*R_n has digits with alternating parity, where R_n is the n-th repunit.
Terms
- a(0) =1a(1) =11a(2) =19a(3) =371a(4) =1891a(5) =36911a(6) =189091a(7) =3690911a(8) =18909091a(9) =369090911a(10) =1890909091a(11) =36909090911a(12) =189090909091
External references
- oeis: A391473