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22
63 is.
As a product of its oprime factors: 2*5*7 = 70
98 is the largest two digit number divisible by 7.
No two digit prime number exists that is a multiple of 7. All two digit numbers that are multiples of 7 are compositenumbers.
56
22
63 is.
As a product of its oprime factors: 2*5*7 = 70
96
98 is the largest two digit number divisible by 7.
No two digit prime number exists that is a multiple of 7. All two digit numbers that are multiples of 7 are compositenumbers.
9991
64
There are none but the smallest 3 digit number is 161
The highest four digit number with 13 and 7 as common factors is 9919, which is equal to 13 x 763 and 7 x 1417.
17