|
Search: id:A075816
|
|
|
| A075816 |
|
Palindromic even numbers with exactly 3 prime factors (counted with multiplicity). |
|
+0
1
|
|
| 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
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
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 this_sequence A100583 A036464 A000938
Adjacent sequences: A075813 A075814 A075815 this_sequence A075817 A075818 A075819
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Jani Melik (jani_melik(AT)hotmail.com), Oct 13 2002
|
|
EXTENSIONS
|
Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Oct 22 2002
|
|
|
Search completed in 0.002 seconds
|
