Unsolved problems in Number Theory. English and Japanese text by Hisanori Mishima.
By Clark Kimberling. Offers prizes for solutions of some problems in number theory.
Conjectures and open problems concerning L-functions, focussing on the areas in which there has bee...
Regarding equal sums of like powers, compiled by Chen Shuwen.
Unsolved Problems in Number Theory, Logic and Cryptography, with references for further reading.