Another joint project which Lehmer undertook with her husband was assisting Vandiver with his work on Fermat's Last Theorem, and together the Lehmers computed many Bernoulli numbers which Vandiver required in his work.
Ibang pinagsamang proyekto na kung saan Lehmer undertook sa kanyang asawa ay tumutulong sa Vandiver sa kanyang trabaho sa Fermat's Last teorama, at magkasama ang Lehmers computed maraming Bernoulli mga numero kung saan Vandiver kinakailangan sa kanyang trabaho.