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A192137
Numbers m such that their concatenation of prime divisors are palindromic numbers.
5
2, 3, 4, 5, 7, 8, 9, 11, 16, 25, 27, 32, 39, 49, 64, 69, 81, 101, 117, 119, 121, 125, 128, 129, 131, 151, 159, 181, 191, 207, 219, 243, 249, 256, 259, 313, 329, 339, 343, 351, 353
OFFSET
1,1
COMMENTS
The corresponding values of palindromic concatenation in A192138. Superset of A002385 (palindromic primes), A192139 and A192140.
LINKS
EXAMPLE
Concatenation of prime divisors of 39 = 3 * 13 is 313 (palindromic number).
MATHEMATICA
Select[Range[2, 500], PalindromeQ[FromDigits[Flatten[IntegerDigits/@ FactorInteger[ #][[All, 1]]]]]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 02 2017 *)
KEYWORD
nonn,base
AUTHOR
Jaroslav Krizek, Jun 24 2011
STATUS
approved