Question

What was Ramanujan's favorite number ..​

Answer 1

Answer:

1729

ʜᴀʀᴅʏ ǫᴜɪᴘᴘᴇᴅ ᴛʜᴀᴛ ʜᴇ ᴄᴀᴍᴇ ɪɴ ᴀ ᴛᴀxɪ ᴡɪᴛʜ ᴛʜᴇ ɴᴜᴍʙᴇʀ '' ᴡʜɪᴄʜ sᴇᴇᴍᴇᴅ ᴀ ғᴀɪʀʟʏ ᴏʀᴅɪɴᴀʀʏ ɴᴜᴍʙᴇʀ. ʀᴀᴍᴀɴᴜᴊᴀɴ sᴀɪᴅ ᴛʜᴀᴛ ɪᴛ ᴡᴀs ɴᴏᴛ. , ᴛʜᴇ ʜᴀʀᴅʏ-ʀᴀᴍᴀɴᴜᴊᴀɴ ɴᴜᴍʙᴇʀ, ɪs ᴛʜᴇ sᴍᴀʟʟᴇsᴛ ɴᴜᴍʙᴇʀ ᴡʜɪᴄʜ ᴄᴀɴ ʙᴇ ᴇxᴘʀᴇssᴇᴅ ᴀs ᴛʜᴇ sᴜᴍ ᴏғ ᴛᴡᴏ ᴅɪғғᴇʀᴇɴᴛ ᴄᴜʙᴇs ɪɴ ᴛᴡᴏ ᴅɪғғᴇʀᴇɴᴛ ᴡᴀʏs.

Answer 2

Answer:

$1729$

Ramanujan replied that 1729 was not a boring number at all: it was a very interesting one. He explained that it was the smallest number that could be expressed by the sum of two cubes in two different ways. This story is very famous among mathematicians. 1729 is sometimes called the “Hardy-Ramanujan number”.