Question

A number which is divisible by the sum of its own
digits is called (Harshad number/Lucas number).​

Answer 1

Answer:

The number 18 is a harshad number in base 10, because the sum of the digits 1 and 8 is 9 (1 + 8 = 9), and 18 is divisible by 9. The Hardy–Ramanujan number (1729) is a harshad number in base 10, since it is divisible by 19, the sum of its digits (1729 = 19 × 91).

Answer 2

Answer:

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