A064768 Sum of primes dividing the repunit numbers with a prime number of digits [A031974] (with repetition).

11, 40, 312, 4888, 534888, 265371785, 5365294080, 1111111111111111111, 11111111111111111111111, 77843964391, 57336415063797550469, 2212394296770453025145, 201763709900322803748658482662

Offset

1,1

Links

Table of n, a(n) for n=1..13.

Crossrefs

Cf. A031974, A001414.

Sequence in context: A356043 A225919 A348586 * A135719 A089776 A073626

Adjacent sequences: A064765 A064766 A064767 * A064769 A064770 A064771

Keyword

nonn,base

Author

Jason Earls, Oct 18 2001

Status

approved