Smallest semiprime ending in exactly n 1's.
A106656
Smallest semiprime ending in exactly n 1's.
Terms
- a(0) =21a(1) =411a(2) =111a(3) =1111a(4) =11111a(5) =2111111a(6) =1111111a(7) =211111111a(8) =2111111111a(9) =21111111111a(10) =11111111111
External references
- oeis: A106656