### Top tip

If someone ever brings up Srinivasa Ramanujan’s genius, in particular his astonishing decomposition of 1729, you can simulate a similar intellect by adding that it’s also the seventh smallest product of three primes separated by a common distance (i.e. 7, 13, 19 in this case). The first six are 105, 231, 627, 897, 935 and 1581.