

A068893


Nonpalindromic numbers that have the same prime signature as their digit reversal.


2



13, 15, 17, 26, 31, 37, 39, 51, 58, 62, 71, 73, 79, 85, 93, 97, 107, 113, 115, 117, 122, 123, 129, 143, 149, 155, 157, 158, 159, 165, 167, 169, 177, 178, 179, 183, 185, 187, 199, 203, 205, 221, 226, 246, 265, 285, 286, 294, 302, 311, 314, 319, 321, 326, 327
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OFFSET

1,1


LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000
Index entries for sequences related to prime signature


EXAMPLE

15 is a term since 15 = 3*5 and 51 = 3*17, and both are of the form p*q where p and q are primes.


MATHEMATICA

sig[n_] := Sort @ FactorInteger[n][[;; , 2]]; Select[Range[300], !PalindromeQ[#] && sig[#] == sig[IntegerReverse[#]] &] (* Amiram Eldar, Dec 30 2020 *)


CROSSREFS

Subsequence of A085869.
Cf. A004086, A118914.
Sequence in context: A354745 A341329 A109019 * A079829 A096090 A037286
Adjacent sequences: A068890 A068891 A068892 * A068894 A068895 A068896


KEYWORD

base,easy,nonn


AUTHOR

Amarnath Murthy, Mar 20 2002


EXTENSIONS

More terms from David Wasserman, Apr 19 2005
Offset corrected by Amiram Eldar, Dec 30 2020


STATUS

approved



