Sum of prime-length repunits: Sum_{k=1..n} r(prime(k)), where r()=A002275.
A097708
Sum of prime-length repunits: Sum_{k=1..n} r(prime(k)), where r()=A002275.
Terms
- a(0) =0a(1) =11a(2) =122a(3) =11233a(4) =1122344a(5) =11112233455
External references
- oeis: A097708