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%I #13 Jul 17 2022 09:21:30
%S 0,11,122,11233,1122344,11112233455,1122223344566,11112233334455677,
%T 1122223344445566788,11112233334455556677899,
%U 11111122223344445566667789010,1122222233334455556677778900121
%N Sum of prime-length repunits: Sum_{k=1..n} r(prime(k)), where r()=A002275.
%e a(3)=11233 because 11 + 111 + 11111 = 11233.
%o (PARI) a(n) = sum(k=1, n, (10^prime(k)-1)/9); \\ _Michel Marcus_, Jul 17 2022
%Y Cf. A097709.
%Y Partial sums of A031974.
%K base,nonn
%O 0,2
%A _Jason Earls_, Aug 21 2004
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