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

1,1

Comments

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

Links

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

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 *)

Crossrefs

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

Sequence in context: A280994 A138039 A289995 * A192139 A080664 A230762

Adjacent sequences: A192134 A192135 A192136 * A192138 A192139 A192140

Keyword

nonn,base

Author

Jaroslav Krizek, Jun 24 2011

Status

approved