The prime P=13 reverses to the prime 31, and its square 169 reverses to 961, which is the square of 31.
Find additional examples where R(P)^2 = R(P^2).
Extra credit for any solution containing a digit larger than 3.
Notes:
. No palindromes like 101 or 10201.
. No modification of an existing solution by stuffing it with zeros, such as 113 modified to 1103 or 11003.
(In reply to
No Subject by Larry)
The actual rule doesn't actually say the reversal of the prime must also be prime; that's just the case shown as a preliminary example.
That might have been the intension, but was not stated--only that the square of the reversal of the prime is the reversal of the square of the prime.
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Posted by Charlie
on 2023-10-31 13:52:44 |
re: No Subject
