Puzzle 1267 How
many emirps are there?
On March 19, 2029, Simon Cavegn wrote:
How many emirps are there?
State whether you are excluding or including
palindromes.
Q1. Find the number of emirps up to the
highest possible n.
Q2-Find a formula that matches the
data. Compare it to n/(ln(n)*ln(n)).
Can a part of the formula be attributed to:
- excluding or including palindromes
- for p > 5 the first digit cannot be 5
- other reverse digit correlations
Q3. Can you create a possibly provable
conjecture, or maybe even a proof, that there are
infinitely many emirps?
