8

This number is a composite.

G. L. Honaker, Jr. offers $8 to the person or team that finds the first occurrence of digit 8 in the constant 1/2 - 1/3 + 1/5 - 1/7 + 1/11 - 1/13 + ... = 0.269... . Breaking News: According to the calculations of Simon Cavegn of Switzerland, the first 8 occurs in the nineteenth decimal place, i.e., pri = 0.2696063519716745948, with the next digit likely a 5. The calculation took 11 days and 10 hours on a Notebook CPU "AI 9 HX 370", implemented in C# using GMP.