What Excel function or expression gives the same results
as the TI83 2-SampTTest function -- at least the p-value?

Ostensibly, TTEST() seems to be the right thing. But it
seems to want to work with the original data.

I want to enter just the means and std devs of the two
samples and compute the p-value.

With a lot of effort, I suppose I could create two normal
distributions that have the same mean and std devs. But
that is "killing an ant with a sledgehammer".

If I had the math formulas for computing the p-value, I
suppose I could create a macro. But sigh, my stat text
is unclear to me now, some time later -- like what should
delta be in the Excel help sheet for "About statistical
analysis tools t-test". Besides, even that is more work
than I think should be necessary.