One of my much-appreciated math-poetry connections is with Scott W. Williams, a Professor of Mathematics at SUNY Buffalo and author of many scholarly papers and many poems. In a recent issue of the Journal of Humanistic Mathematics (JHM) I found (and valued reading) his "Impossible Haiku" -- a series of Haiku-stanzas that play with the Collatz Conjecture -- an unproven belief that for any starting number these two steps, performed in appropriate succession, eventually reach the number 1:
If the number is odd, multiply by 3 and add 1; if the number is even, divide it by 2.
Williams' "Impossible Haiku" may be found at this link. Another mathy poem by Williams (found here at his website) that I especially value is the one that I offer below -- a poem dedicated to his mother.
THE NINE-SIDED DIAMOND by Scott Williams