ashleyyoon18 ashleyyoon18

03-11-2020
Mathematics

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Let an optimus prime be a prime number whose digit sum is also a prime number. How
many of the first 10 primes are optimus primes?

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AbyssSubZero AbyssSubZero

03-11-2020

Answer:

7

Step-by-step explanation:

2 = 2 ✓

3 = 3 ✓

5 = 5 ✓

7 = 7 ✓

11 = 1 + 1 = 2 ✓

13 = 1 + 3 = 4 ×

17 = 1 + 7 = 8 ×

19 = 1 + 9 = 10 ×

23 = 2 + 3 = 5 ✓

29 = 2 + 9 = 11 ✓

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