a prime number whose digits are sequential
Hey! That makes me and Arach the same age. Except that my sequential digits add up to another prime. Ok, ok, for the mathematically challenged I'm a ripe old 67 (very ripe, very old). That makes me the oldest posting so far. Sorry to drag the average off the deep end. Have six grandkids who demonstrate the Flynn effect to the extreme. (From Wikipedia: "The Flynn effect is the rise of average Intelligence Quotient (IQ) test scores, an effect seen in most parts of the world...The average rate of rise seems to be around three IQ points per decade.") They're already smarter than I think I remember that I used to be.
I'm very happy to be in this illustrious group with average age of 37.7. Now, when people ask me how old I am, I can tell them that there is a high probability that I'm in my late 30's.
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