Question

what are the prime numbers
1,9,17,27,37,39

Answer 1

1 and 17?

Answer 2

Prime numbers have only two factors,
1. 1.
2. itself.

Answer 3

prime number- an integer that has no integral factors but itself and 1.

Answer 4

1,17,37

Answer 5

here's a handy list in case you don't feel like thinking
http://primes.utm.edu/lists/small/1000.txt

Answer 6

From Mathematica, 17 and 37

Answer 7

I learn something new everyday, 1 is not prime.
Most early Greeks did not even consider 1 to be a number,[4] so did not consider it a prime. In the 19th century however, many mathematicians did consider the number 1 a prime. For example, Derrick Norman Lehmer's list of primes up to 10,006,721, reprinted as late as 1956,[5] started with 1 as its first prime.[6] Henri Lebesgue is said to be the last professional mathematician to call 1 prime.[7] Although a large body of mathematical work is also valid when calling 1 a prime, the above fundamental theorem of arithmetic does not hold as stated. For example, the number 15 can be factored as 3 · 5 or 1 · 3 · 5. If 1 were admitted as a prime, these two presentations would be considered different factorizations of 15 into prime numbers, so the statement of that theorem would have to be modified. Furthermore, the prime numbers have several properties that the number 1 lacks, such as the relationship of the number to its corresponding value of Euler's totient function or the sum of divisors function.[8][9]

source-Wikipedia