13 Jul
2016
13 Jul
'16
9:15 a.m.
Thanks, Neil! I don't know why I didn't think to check the OEIS. Jim, that is https://oeis.org/A027828.
Actually it's https://oeis.org/A027878.
If you find out something interesting, please add a comment there. There is a certain amount of info there already, of course.
I doesn't appear that anyone has published anything about the middle digits. When I get a chance I might tally the hundred middle digits for progressively larger n, to see if some sort of asymptotic equidistribution appears to be going on there. Jim