List questions from palindrome

74

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Is $\sigma(2^r)$ a palindrome (in base $10$) for some $r > 2$, where $\sigma$ is the sum-of-divisors function?

Published on 13 Feb 2016 - 15:13

1.1k

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Simplification of the sum of all 4-digit palindromic numbers

Published on 09 Mar 2026 - 5:59

194

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What is the name of this type of palindromic number?

Published on 17 Mar 2016 - 10:41

8.1k

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recursive definition of a palindrome help

Published on 19 Mar 2026 - 16:28

72

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On the GCD of two palindromes.

Published on 21 May 2016 - 0:17

4k

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how many n-digit palindromes exist

Published on 22 May 2016 - 3:52

6.2k

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The largest product of two n-digit numbers which is palindrome

Published on 24 Mar 2026 - 7:21

6.7k

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3 digit Prime Palindrome Numbers.

Published on 15 Jun 2016 - 4:35

378

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What relationship(s) [if any] exist between primorial primes and palindromic primes?

Published on 04 Apr 2013 - 8:07

2.7k

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Distribution of palindromic numbers

Published on 11 Apr 2013 - 16:49

2.2k

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palindromic squares of palindromes

Published on 14 Apr 2013 - 5:20

697

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Number of five digit palindromes that are a sum of two four digit palindromes

Published on 23 Apr 2013 - 11:37

1.4k

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Finding a palindromic number which is the difference of two palindromic numbers

Published on 29 May 2013 - 8:59

1.4k

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Recursive equation for binary palindromes

Published on 13 Jun 2013 - 1:33

2k

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Is 2201 really the only non-palindromic number whose cube is palindromic?

Published on 01 Jul 2013 - 22:39

List Question

Is $\sigma(2^r)$ a palindrome (in base $10$) for some $r > 2$, where $\sigma$ is the sum-of-divisors function?

Simplification of the sum of all 4-digit palindromic numbers

What is the name of this type of palindromic number?

recursive definition of a palindrome help

On the GCD of two palindromes.

how many n-digit palindromes exist

The largest product of two n-digit numbers which is palindrome

3 digit Prime Palindrome Numbers.

What relationship(s) [if any] exist between primorial primes and palindromic primes?

Distribution of palindromic numbers

palindromic squares of palindromes

Number of five digit palindromes that are a sum of two four digit palindromes

Finding a palindromic number which is the difference of two palindromic numbers

Recursive equation for binary palindromes

Is 2201 really the only non-palindromic number whose cube is palindromic?

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