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Search: id:A071251
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| A071251 |
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Square-free palindromes. |
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+0
1
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| 1, 2, 3, 5, 6, 7, 11, 22, 33, 55, 66, 77, 101, 111, 131, 141, 151, 161, 181, 191, 202, 222, 262, 282, 303, 313, 323, 353, 373, 383, 393, 434, 454, 474, 494, 505, 515, 535, 545, 555, 565, 595, 606, 626, 646, 707, 717, 727, 737, 757, 767, 777, 787, 797, 818, 838
(list; graph; listen)
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OFFSET
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1,2
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MAPLE
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ffpal := proc(n) local i, j, k, s, aa, nn, bb, flag; s := n; aa := convert(s, string); nn := length(aa); bb := ``; for i from nn by -1 to 1 do bb := cat(bb, substring(aa, i..i)); od; flag := 0; for j from 1 to nn do if substring(aa, j..j)<>substring(bb, j..j) then flag := 1 fi; od; RETURN(flag); end: ts_ndk_pal := proc(i) if ffpal((i)) = 0 then if (numtheory[issqrfree](i) = 'true' ) then RETURN((i)) fi fi end: andkpal := [seq(ts_ndk_pal(i), i=1..10000)]: andkpal;
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MATHEMATICA
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Select[ Range[ 1000], # == FromDigits[ Reverse[ IntegerDigits[ # ]]] && Max[ Transpose[ FactorInteger[ # ]] [[2]]] < 2 &]
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CROSSREFS
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Cf. A002385, A069217, A032350, A005117, A035132.
Sequence in context: A023798 A062084 A098959 this_sequence A077571 A101730 A039058
Adjacent sequences: A071248 A071249 A071250 this_sequence A071252 A071253 A071254
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 21 2002
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EXTENSIONS
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Edited by Robert G Wilson v (rgwv(AT)rgwv.com) Jun 03 2002
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