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A187125
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Primes of the form abcdabcd..abcdabc.
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1
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1074107, 1076107, 1079107, 1093109, 1098109, 1114111, 1117111, 1131113, 1134113, 1171117, 1191119, 1193119, 1196119, 1212121, 1215121, 1218121, 1273127, 1294129, 1297129, 1311131, 1317131, 1333133, 1336133, 1371137, 1373137, 1377137, 1379137, 1398139
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history;
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OFFSET
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1,1
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COMMENTS
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The sequence appears to be infinite. The number of terms below 10^1000 are 5137.
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LINKS
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Shyam Sunder Gupta, Table of n, a(n) for n = 1..2483
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EXAMPLE
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a(2)= 1076107 is in the sequence because it is a prime of the form abcdabc.
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MATHEMATICA
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s[n_]:=Select[Union@Flatten@Table[FromDigits@Flatten@Join[IntegerDigits@Table[b, {n}], {IntegerDigits@Floor[b/10]}], {b, 1000, 9999}], PrimeQ]; Array[s, 2]//Flatten
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CROSSREFS
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Cf. A228625, A228627
Sequence in context: A342328 A070042 A258061 * A237972 A252038 A236449
Adjacent sequences: A187122 A187123 A187124 * A187126 A187127 A187128
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KEYWORD
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nonn,base
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AUTHOR
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Shyam Sunder Gupta, Aug 30 2013
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STATUS
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approved
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