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A187114
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Primes of the form abcdabcd..abcdab.
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1
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110311, 110711, 111211, 111611, 112111, 113011, 113111, 114311, 115211, 115811, 116411, 116911, 117511, 117811, 117911, 118211, 118411, 119311, 119611, 130513, 131113, 131213, 131413, 131713, 132113, 132313, 133013, 133213, 133813, 134213, 134513, 135613
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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 5211.
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LINKS
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EXAMPLE
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a(2)= 110711 is in the sequence because it is a prime of the form abcdab.
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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/100]}], {b, 1000, 9999}], PrimeQ]; Array[s, 2]//Flatten
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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