https://twitter.com/jamestanton/status/1374357705968603136

twenty-four.py

#! /usr/bin/python
from math import prod

def compute_digits( n ):
    if n <= 9:
        return [ n ]
    else:
        return compute_digits( n // 10 ) + [ n % 10 ]

def is_robust( value ):
    digits = compute_digits( value )
    s = sum( digits )
    if s % len( digits ) != 0:
        return False
    avg = s / len( digits )

    lo = min( digits )
    hi = max( digits )
    if lo == 0 or lo == hi:
        return False

    things_to_try = digits + [ avg, lo, hi, hi-lo, len( digits ), s, prod( digits ) ]
    badness = [ True for denominator in things_to_try if value % denominator != 0 ]
    return not badness

for n in range( 1, 9999999 ):
    if is_robust( n ):
        print( n )