A recent email from Colm Mulcahy -- who seeks out all things Irish -- alerted me to Dublin poet and math-text author, George Darley (1795-1846), and an online archived collection of his poems. Colm's email had opened the collection to pages 70-71 and there I found -- and had fun reading -- this poem that plays with math.
A Poetical Problem. by George Darley
Once on a time, at evening hour,
A sweet, and dewy-bosom'd Flower
Was cradling up to rest ;
A Pilgrim, wandering near her bed,
Raised, with his staff, her drooping head,
And thus the Flower addrest :
"From matin-rise to moonlight hour,
Tell me, my pearly-crested Flower,
How many a lucid gem
Hath left the high, cavernal air,
To form upon thy queenly hair
A rainbow diadem?"