perplexus.info :: Numbers : Primed Palindromes

Primed Palindromes (Posted on 2008-12-27)

A prime number less than 100 is increased by 1 and squared.
This square is incremented by 1 to yield a prime which is then squared.
The digits of this second square are reversed and added to that square resulting in a palindrome.

For which primes does this occur?

Submitted by brianjn

Rating: 5.0000 (1 votes)

Solution: (Hide)

19 20 400 401 160801 108061 268862 89 90 8100 8101 65626201 10262656 75888857
At the time of writing this my concept included "1" as prime, I now know better.
1 2 4 5 25 52 77

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Puzzle Answer	K Sengupta	2022-05-17 02:12:36
computer solution	Charlie	2008-12-27 23:47:41
Solution	Dej Mar	2008-12-27 19:22:48

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