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A187113
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Primes of the form abcdabcd..abcda.
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1
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10061, 10091, 10111, 10141, 10151, 10181, 10211, 10271, 10301, 10321, 10331, 10391, 10501, 10531, 10601, 10631, 10651, 10691, 10711, 10771, 10781, 10831, 10861, 10891, 11071, 11131, 11161, 11171, 11251, 11261, 11311, 11321, 11351, 11411, 11471, 11491, 11551
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refs;
listen;
history;
text;
internal format)
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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 5749.
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LINKS
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Shyam Sunder Gupta, Table of n, a(n) for n = 1..3032
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EXAMPLE
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a(2)= 10091 is in the sequence because it is a prime of the form abcda.
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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/1000]}], {b, 1000, 9999}], PrimeQ]; Array[s, 2]//Flatten
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CROSSREFS
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Cf. A228625, A228627
Sequence in context: A250711 A223431 A203089 * A023356 A292176 A198484
Adjacent sequences: A187110 A187111 A187112 * A187114 A187115 A187116
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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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