Generate a list of 5 famous mathematicians in the 19th and 20th centuries.
1. Carl Friedrich Gauss (1777-1855) – A German mathematician who made important contributions to several fields including number theory, algebra and statistics.

2. Leonard Euler (1707-1783) – A Swiss mathematician known for his contributions to calculus, graph theory, and mathematical notation.

3. Henri Poincaré (1854-1912) – A French mathematician, theoretical physicist and philosopher of science, who made significant contributions to several fields including topology and celestial mechanics.

4. Srinivasa Ramanujan (1887-1920) – An Indian mathematician known for his contributions to mathematical analysis, number theory and continued fractions.

5. John von Neumann (1903-1957) – A Hungarian-American mathematician who made significant contributions to mathematics, physics, computer science, and economics. He is regarded as one of the founders of modern computing.
Complete the following task based on the instruction and optional input provided.### Instruction:
Generate a list of 5 famous mathematicians in the 19th and 20th centuries.

### Output:
1. Carl Friedrich Gauss (1777-1855) – A German mathematician who made important contributions to several fields including number theory, algebra and statistics.

2. Leonard Euler (1707-1783) – A Swiss mathematician known for his contributions to calculus, graph theory, and mathematical notation.

3. Henri Poincaré (1854-1912) – A French mathematician, theoretical physicist and philosopher of science, who made significant contributions to several fields including topology and celestial mechanics.

4. Srinivasa Ramanujan (1887-1920) – An Indian mathematician known for his contributions to mathematical analysis, number theory and continued fractions.

5. John von Neumann (1903-1957) – A Hungarian-American mathematician who made significant contributions to mathematics, physics, computer science, and economics. He is regarded as one of the founders of modern computing.