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No

21 isn't (= 3 x 7)

51 isn't (= 3 x 17)

81 isn't ( = 9 x 9)

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What prime numbers remain prime numbers when their tens are changed?

All prime numbers ending in 1, 3, 7 or 9. For example, 31 and 71 23 and 43 17 and 47 19 and 79.


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How many prime numbers between 1 and 8888888888888888888888888888888888888888888888?

To determine the number of prime numbers between 1 and 8888888888888888888888888888888888888888888888, we can use the Prime Number Theorem. This theorem states that the density of prime numbers around a large number n is approximately 1/ln(n). Therefore, the number of prime numbers between 1 and 8888888888888888888888888888888888888888888888 can be estimated by dividing ln(8888888888888888888888888888888888888888888888) by ln(2), which gives approximately 1.33 x 10^27 prime numbers.