Zhang Lirang can a sequence of 10,000 figures after the decimal point of the ratio of circumference.

A 70-year-old resident of Hefei, Anhui province, can recite a sequence of 10,000 figures after the decimal point of the ratio of circumference.

Zhang has offered a 10,000-yuan ($1,471) reward to anyone who can challenge his memory, and is willing to raise the amount to 100,000 yuan.

Zhang had a tuberculosis relapse in 1998, and began training to improve his memory, which weakened due to the illness.