Repunits with even indices multiplied by 99, i.e., 99*(11, 1111, 111111, 11111111, ...).
A274755
Repunits with even indices multiplied by 99, i.e., 99*(11, 1111, 111111, 11111111, ...).
Terms
- a(0) =1089a(1) =109989a(2) =10999989a(3) =1099999989a(4) =109999999989
External references
- oeis: A274755