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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 13 16:10 EDT 2019. Contains 327966 sequences. (Running on oeis4.)