There is a mathematical constant named after a 19th-century mathematician that is approximately 0.318 - Apparently.
The Ramanujan constant is a mathematical constant named after Srinivasa Ramanujan, an Indian mathematician who made significant contributions to number theory. This constant is the average of the first 17 digits of the mathematical constant e, which is approximately 2.71828. The Ramanujan constant is approximately 0.318, and it has been calculated to over 100,000 decimal places.