Sistu. Banu Prakash (born on April 28, 2005) of Andhra Pradesh, India, set a record for using the maximum number of mathematical formulae and symbols for a portrait. He drew the portrait of an Indian Mathematician Srinivasa Ramanujan on an A1 sheet (measuring 72 cm x 58 cm) and completed the picture by aesthetically writing 205 mathematical formulae and 55 symbols with a blue ballpoint pen, as confirmed on February 5, 2021.