Raymond Quenau (1903-1976), a French writer and mathematician.
Even if he wasn't a professional mathematician, he dealt with mathematics and published writings of mathematics and about mathematics.
It seems to me that he passed the Zentralblatt test:
He studied mathematics at university, and during all his life he continued to cultivate his passion for mathematics, also participating to seminars of the most important mathematicians in Paris. In particular he participated to the meetings of Bourbaki in the fifties, and had a frendship and professional collaboration with Geoge Kreisel, collaborating to the book Elements de logique mathématique, published by Kreisel and Krivine in 1968.
He made research about number theory. The results of his work about integers were presented at the Académie des sciences in Paris on April 1968. And it was subsequently published in the Journal of Combinatory Theory, commented by the famous mathematician Giancarlo Rota.
Those and other information about Quenau mathematician and writer can be found in
But, above all, Raymond Queneau is famous as writer and poet.
He was a prominent figure in the French literature of the twentieth century, in particular for experimental literature.
He founded, together with his friend Perec, the Oulipo (Ouvroir de Litérature Potentielle), an experimental writing group, where the use of mathematical structures in literary endeavours was discussed.
His most well known novels are Zazié dans le metro (1959), Les fleuers bleues (1965) , and he is famous for his Exercises de style (1947).
In addition, we cannot forget Martin Gardner, who wrote novels and short stories. He is so famous that needs no introduction:
He passed the Zentralblatt test: