Q: What is the first two digit prime number for which the product of its digits is equal to the sum of its digits plus seven?

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121

1

There are 15 of them.

21 and 20

55 52+52 = 50

Related questions

121

1

There are 15 of them.

15 1 x 5 = 5, and 5 x 3 = 15

21 and 20

The Answer is 36 btw. 3 + 6 = 9 3 x 6 = 2(3x6) 2(18) = 36

412

A two digit number whose two digits added together equal 42 and multiplied together equal 82

55 52+52 = 50

Only if the final digit, after the decimal point, is zero.

No. Take 12 for example. 1+2=3 but 1x2 doesn't equal 3, it equals 2.

1348.