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A226732 Palindromes that cannot be expressed as a nontrivial product of two palindromes. 0
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

Table of n, a(n) for n=1..54.

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

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Last modified October 15 18:26 EDT 2019. Contains 328037 sequences. (Running on oeis4.)