From the history of maths
Sophie Germain
She taught herself mathematics from her father’s library during the French Revolution, and wrote to Gauss as “Monsieur LeBlanc”.
A prime p for which 2p + 1 is also prime is called a Sophie Germain prime.
From Germain’s Œuvres philosophiques (1896), Public domain, via Wikimedia Commons
Where you’ll meet Germain here
They turn up beside problems and lessons on these topics.
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Srinivasa Ramanujan
Largely self-taught, he wrote to G. H. Hardy at Cambridge in 1913 with pages of startling formulas. Hardy said some were so strange they had to be true, because nobody could have made them up.
1729 is the Hardy–Ramanujan number: the smallest number that is a sum of two cubes in two ways, 1³ + 12³ = 9³ + 10³. Ramanujan spotted it when Hardy called his taxi number dull.
Unknown author, CC BY 4.0, via Wikimedia Commons (resized)