# True or false identity?

I found the logo from The Eighth Congress of Romanian Mathematicians. I think this is the von Mangoldt summatory function and with a simple computation, using this definition, I obtained $83$. Am I wrong or how can the following be true?$$\sum_{i=1929}^{2015}\Lambda(i)=8$$

• Apparently their $\Lambda$ is not the von Mangoldt function. Jun 30 '15 at 16:03
• The Seventh congress used $\chi$ as the function and had an upper limit of 2011. The Sixth was in 2007, I don't recall whether this "joke" was used there. Jun 30 '15 at 23:34

$$\Lambda(i)= \begin{cases} 1\quad\text{if a Congress was held in year }i\\ 0\quad\text{otherwise} \end{cases}$$
Note the indices of summation look a lot like years; $\Lambda : \mathbb{N} \to \{0, 1\}$ is the function indicating whether that year had a Congress of Romanian Mathematicians.