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A075816 Palindromic even numbers with exactly 3 prime factors (counted with multiplicity). 0

%I #6 Jun 24 2014 01:08:26

%S 8,44,66,212,222,242,282,292,404,434,474,494,606,646,2222,2882,4334,

%T 4994,6226,6446,6886,8338,8558,8998,20002,20402,20702,20802,20902,

%U 21212,22222,22922,23132,24042,24342,24542,24742,24942,25052,26062

%N Palindromic even numbers with exactly 3 prime factors (counted with multiplicity).

%e 44=2^2*11, 66=2*3*11 and 212=2^2*53 are palindromic, even and products of 3 prime factors.

%p test := proc(n) local d; d := convert(n,base,10); return ListTools[Reverse](d)=d and numtheory[bigomega](n)=3 and not isprime(n); end; a := []; for n from 2 to 27000 by 2 do if test(n) then a := [op(a),n]; end; od; a;

%K nonn,base

%O 1,1

%A _Jani Melik_, Oct 13 2002

%E Edited by _Dean Hickerson_, Oct 22 2002

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Last modified April 16 12:52 EDT 2024. Contains 371711 sequences. (Running on oeis4.)