A075809 - OEIS

%I #11 Jan 05 2025 23:40:44

%S 2,66,222,282,434,474,494,606,646,2222,2882,4334,4994,6006,6226,6446,

%T 6886,8338,8558,8778,8998,20002,20202,20702,20802,20902,22222,22922,

%U 24042,24342,24542,24742,24942,26062,26162,26462,28082,28182,28282

%N Palindromic even numbers with an odd number of distinct prime factors.

%H Robert Israel, <a href="/A075809/b075809.txt">Table of n, a(n) for n = 1..10000</a>

%e 66=2*3*11, 222=2*3*37 and 282=2*3*47 are palindromic, even and products of an odd number of distinct primes.

%p test := proc(n) local d; d := convert(n,base,10); return ListTools[Reverse](d)=d and numtheory[mobius](n)=-1; end; a := []; for n from 2 to 30000 by 2 do if test(n) then a := [op(a),n]; end; od; a;

%Y Cf. A053858.

%K nonn,base,look

%O 1,1

%A _Jani Melik_, Oct 13 2002

%E Edited by _Dean Hickerson_, Oct 21 2002