A097708 - OEIS

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A097708

Sum of prime-length repunits: Sum_{k=1..n} r(prime(k)), where r()=A002275.

1

0, 11, 122, 11233, 1122344, 11112233455, 1122223344566, 11112233334455677, 1122223344445566788, 11112233334455556677899, 11111122223344445566667789010, 1122222233334455556677778900121

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..11.

EXAMPLE

a(3)=11233 because 11 + 111 + 11111 = 11233.

PROG

(PARI) a(n) = sum(k=1, n, (10^prime(k)-1)/9); \\ Michel Marcus, Jul 17 2022

CROSSREFS

Partial sums of A031974.

Sequence in context: A163462 A334000 A041222 * A015499 A039438 A258843

Adjacent sequences: A097705 A097706 A097707 * A097709 A097710 A097711

KEYWORD

base,nonn

AUTHOR

Jason Earls, Aug 21 2004

STATUS

approved