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Palindromes with exactly 4 prime factors (counted with multiplicity).
5

%I #12 Jul 07 2024 18:47:39

%S 88,232,414,424,444,484,525,585,636,666,676,686,808,858,868,999,1881,

%T 2002,2332,2442,2662,3003,3663,3773,3993,4114,4444,4774,5005,5115,

%U 5225,6116,6556,6666,7007,7227,8668,9999,10101,10701,11011,12321,13431

%N Palindromes with exactly 4 prime factors (counted with multiplicity).

%H John Cerkan, <a href="/A046330/b046330.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Range[14000],PalindromeQ[#]&&PrimeOmega[#]==4&] (* _Harvey P. Dale_, Jul 07 2024 *)

%Y Cf. A014613, A046317, A046410.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Jun 15 1998

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Last modified September 23 18:10 EDT 2024. Contains 376182 sequences. (Running on oeis4.)