The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A226732 Palindromes that cannot be expressed as a nontrivial product of two palindromes. 2
 1, 2, 3, 5, 7, 11, 101, 111, 131, 141, 151, 161, 171, 181, 191, 212, 232, 252, 272, 292, 313, 323, 343, 353, 373, 383, 414, 434, 454, 474, 494, 515, 525, 535, 545, 565, 575, 585, 595, 656, 676, 717, 727, 737, 747, 757, 767, 787, 797, 818, 838, 858, 878, 898 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Complement of A078337. LINKS Giovanni Resta, Table of n, a(n) for n = 1..10000 MATHEMATICA palQ[n_] := Reverse[x = IntegerDigits[n]] == x; t1 = Rest[Select[Range[900], palQ[#] &]]; Join[{1}, Complement[t1, Union[Flatten[Table[i*j, {i, t1}, {j, t1}]]]]] CROSSREFS Cf. A078337. Sequence in context: A323697 A103850 A288369 * A083393 A182051 A052480 Adjacent sequences:  A226729 A226730 A226731 * A226733 A226734 A226735 KEYWORD nonn,base AUTHOR Jayanta Basu, Jun 16 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 30 12:39 EDT 2021. Contains 346359 sequences. (Running on oeis4.)