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

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

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