Problem Description Eddy’s interest is very extensive, recently he is interested in prime number. Eddy discover the all number owned can be divided into the m...
Problem Description The digital root of a positive integer is found by summing the digits of the integer. If the resulting value is a single digit then that d...
Problem Description A number whose only prime factors are 2,3,5 or 7 is called a humble number. The sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18...