Thread: Other Primes
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Old 2021-09-15, 16:06   #266
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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Quote:
Originally Posted by paulunderwood View Post
UTM's Prime Pages parser calculated the decimal digits as 1234568
Prof.Caldwell's calculator had insufficient precision. I'll drop him a note. It is, of course, 1234567.

All palindromes of even length (except 11) are composite!
Hint: they are divisible by 11
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