

A075816


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


0



8, 44, 66, 212, 222, 242, 282, 292, 404, 434, 474, 494, 606, 646, 2222, 2882, 4334, 4994, 6226, 6446, 6886, 8338, 8558, 8998, 20002, 20402, 20702, 20802, 20902, 21212, 22222, 22922, 23132, 24042, 24342, 24542, 24742, 24942, 25052, 26062
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..40.


EXAMPLE

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


MAPLE

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;


CROSSREFS

Sequence in context: A046341 A046329 A046377 * A290787 A188148 A316466
Adjacent sequences: A075813 A075814 A075815 * A075817 A075818 A075819


KEYWORD

nonn,base


AUTHOR

Jani Melik, Oct 13 2002


EXTENSIONS

Edited by Dean Hickerson, Oct 22 2002


STATUS

approved



