"For the first time in five-years-and-a-day, my legal age is once again a prime number."
So, 6 years ago it was a prime number, if I'm reading this right (because 5 years and a day ago, he was 6 whole years younger, if you say that your age doesn't advance until your birthday [which is what he means by legal age]). So find two primes, P1 and P2, whose difference is 6. We can also safely assume that the primes are less than, say, 70 and greater than, say, 7. So we have a list of primes: {11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67}. So we have a set of differences {4, 4, 2, 4, 6, 2, 6, 4, 2, 4, 6, 6, 2, 6}. Pick out the 5 pairs that are separated by 6: {(23, 29), (31,37), (47, 53), (53, 59), (61, 67)}. I'm willing to bet that he turned 29 today... =)
Drew |
