So I've been interested in philosophies of different sorts in the past, but nowadays I've reduced philosophy only to topics in philosophy of science, because the other branches are so inconclusive and often useless in practice.
But if I was to read about some philosophies regarding mathematics, I might actually learn something new that would improve my thinking towards studying and reading mathematics.
Some of the topics that particularly interest me are:
The relationship between the real world and mathematical objects.
The philosophy of mathematical systems (that is, e.g. is logically exact mathematics good or bad (and why?) compared to more relaxed systems of logic)
The relationship of mathematics to other sciences (but I don't want to read any hocuspocus here, but something that's as rigid as natural scientific thought and as practical as real world natural scientific research).
Also, I'm not interested in reading philosophical thoughts that much as reasoning that's inherently tied to mathematical research. I.e. I don't want to read opinions about mathematics, but philosophy that's related to mathematical research. I for example am not sure whether some "schools of thought" (formalism, logicism, ...) are that useful per se, but the ideas that they have regarding the improvement of mathematics could be more interesting than some dogmatic theses or idealistic theories (e.g. "mathematics is an universal language").