[seqfan] Re: Wrong Formula?

[franktaw at netscape.net]

You are right.  The first comment is wrong in the same way: the main 
diagonal is the number of divisors, not the sum of the divisors.

I'm going to add comments to A051731, A077049, and A077051, noting that 
they are all essentially the same thing.

Franklin T. Adams-Watters


-----Original Message-----
From: Leroy Quet <q1qq2qqq3qqqq at yahoo.com>

This seems like a dumb question to me, but I thought I would post this 
anyway in
order to be 100% certain.

Is the formula for sequence A077478 wrong? Shouldn't that "sigma" be a 
"tau" or
"d"?

Thanks,
Leroy Quet