A168355 Products of 3 distinct primes whose binary expansion is palindromic.

165, 195, 231, 255, 273, 455, 561, 645, 903, 1023, 1105, 1533, 2015, 2193, 2289, 2409, 2553, 2829, 3171, 3219, 3435, 3855, 3999, 4161, 4433, 4953, 5285, 5397, 5621, 5709, 6141, 6307, 6643, 7163, 7239, 7511, 8481, 9417, 9705, 10245, 11805, 12093, 12291

Offset

1,1

Comments

All terms are odd. - Chai Wah Wu, Mar 28 2016

Links

Chai Wah Wu, Table of n, a(n) for n = 1..10000

Example

165=3*5*11={1,0,1,0,0,1,0,1} 195=3*5*13={1,1,0,0,0,0,1,1}

Mathematica

f1[n_]:=Reverse[IntegerDigits[n, 2]]==IntegerDigits[n, 2]; f2[n_]:=Last/@FactorInteger[n]=={1, 1, 1} lst={}; Do[If[f1[n]&&f2[n], AppendTo[lst, n]], {n, 8!}]; lst

Crossrefs

Cf. A016041.

Sequence in context: A197440 A261758 A252725 * A083255 A259283 A319502

Adjacent sequences: A168352 A168353 A168354 * A168356 A168357 A168358

Keyword

nonn,base

Author

Vladimir Joseph Stephan Orlovsky, Nov 23 2009

Status

approved