A046396 Palindromes with exactly 6 distinct prime factors.

222222, 282282, 474474, 555555, 606606, 646646, 969969, 2040402, 2065602, 2206022, 2417142, 2646462, 2673762, 2875782, 3262623, 3309033, 4179714, 4192914, 4356534, 4585854, 4912194, 5021205, 5169615, 5174715, 5578755

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Mathematica

Select[Range[6*10^6], #==IntegerReverse[#]&&PrimeNu[#]==PrimeOmega[#]==6&] (* The program uses the IntegerReverse function from Mathematica version 10 *) (* Harvey P. Dale, Mar 17 2016 *)

Crossrefs

Cf. A046332.

Sequence in context: A254509 A254516 A254816 * A083640 A253990 A253997

Adjacent sequences: A046393 A046394 A046395 * A046397 A046398 A046399

Keyword

nonn,base

Author

Patrick De Geest, Jun 15 1998

Status

approved