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Search: id:A071606
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| A071606 |
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Smallest zero-free palindromic prime of 2n + 1 digits. |
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+0
1
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| 2, 131, 11311, 1114111, 111181111, 11112721111, 1111118111111, 111111151111111, 11111112521111111, 1111111111111111111, 111111111161111111111, 11111111111111111111111
(list; graph; listen)
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OFFSET
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0,1
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MATHEMATICA
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a[n_] := Block[{k = (10^(n + 1) - 1)/9}, While[m = FromDigits[ Join[ IntegerDigits[k], Reverse[ Drop[ IntegerDigits[k], -1]]]]; !PrimeQ[m], k++ ]; m]; Table[ a[n], {n, 0, 13}]
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CROSSREFS
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Cf. A028989.
Sequence in context: A125633 A089662 A119778 this_sequence A080282 A131931 A020524
Adjacent sequences: A071603 A071604 A071605 this_sequence A071607 A071608 A071609
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KEYWORD
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nonn,base
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Jun 21 2002
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EXTENSIONS
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Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 21 2002
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