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To find the digital root of a number, repeatedly add its digits (called "digit sum") until you're left with a 1-digit number, 1 thru 9; e.g., 19 (a Prime number) = 1+9 = 10 = 1+0 = 1, i.e., the digital root of 19 is 1 [sometimes expressed as 19=dr(1)]. Here's one more example, 89 (a prime) = 8+9 = 17 = 1+7 = dr(8).

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Q: What are digital roots of prime numbers?
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