A035135 Cubefree composite palindromes.

4, 6, 9, 22, 33, 44, 55, 66, 77, 99, 111, 121, 141, 161, 171, 202, 212, 222, 242, 252, 262, 282, 292, 303, 323, 333, 363, 393, 404, 414, 434, 444, 454, 474, 484, 494, 505, 515, 525, 535, 545, 555, 565, 575, 585, 595, 606, 626, 636, 646, 666, 676, 707, 717

Offset: 1

Author

Patrick De Geest, Nov 15 1998

Keywords

• nonn
• base

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000
• Eric Weisstein's World of Mathematics, Cubefree.

Crossrefs

Intersection of A002113, A002808 and A004709.

Cf. A035133, A035134.

Programs

Mathematica

cufQ[n_]:=Max[Transpose[FactorInteger[n]][[2]]]<=2; palQ[n_]:=FromDigits[Reverse[IntegerDigits[n]]]==n; Select[Range[2,718],!PrimeQ[#] && cufQ[#] && palQ[#] &] (* Jayanta Basu, May 12 2013 *)