A192138 - OEIS

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A192138

Palindromic concatenation of prime divisors of numbers from A192137.

2, 3, 2, 5, 7, 2, 3, 11, 2, 5, 3, 2, 313, 7, 2, 323, 3, 101, 313, 717, 11, 5, 2, 343, 131, 151, 353, 181, 191, 323, 373, 3, 383, 2, 737, 313, 747, 3113, 7, 313, 353, 373, 383, 343, 1331, 31113, 767, 353, 313, 2, 323, 5, 373, 3223, 797, 727, 3, 383, 757, 787, 3553

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..61.

EXAMPLE

a(13) = 313 because A192137(13) = 39 = 3 * 13.

MATHEMATICA

f[n_] := FromDigits[Flatten[IntegerDigits /@ FactorInteger[n][[;; , 1]]]]; Select[f /@ Range[2, 1900], PalindromeQ] (* Amiram Eldar, Aug 06 2024 *)

CROSSREFS

Cf. A002113, A002385, A084317, A084092, A192137, A192139, A192140, A192141.

Sequence in context: A182898 A133684 A286151 * A175264 A025473 A351847