echo "it is an armstrong";
echo "it is not armstrong";
it is not armstrong
What is armstrong number and why it is called armstrong number
An Armstrong three-digit number is an integer in which the sum of the cubes of its digits equals the number. The angstrom () is a length measurement unit for light wavelengths. It’s the same as 1010 metres, or 0.1 nanometers. Anders Jonas ngström, a 19th-century Swedish physicist, was the inspiration for the name.