A192137 Numbers m such that their concatenation of prime divisors are palindromic numbers.

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

Author

Jaroslav Krizek, Jun 24 2011

Keywords

• nonn
• base

Comments

The corresponding values of palindromic concatenation in A192138. Superset of A002385 (palindromic primes), A192139 and A192140.

Examples

			Concatenation of prime divisors of 39 = 3 * 13 is 313 (palindromic number).
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A002113, A002385, A084317, A084092, A192138, A192139, A192140, A192141.

Programs

Mathematica

Select[Range[2,500],PalindromeQ[FromDigits[Flatten[IntegerDigits/@ FactorInteger[ #][[All,1]]]]]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 02 2017 *)