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A068680
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Primes formed by the concatenation n, n+2, n.
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3
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131, 353, 797, 171917, 232523, 272927, 293129, 313331, 333533, 373937, 495149, 515351, 575957, 596159, 616361, 636563, 676967, 737573, 777977, 798179, 838583, 878987, 899189, 103105103, 109111109, 111113111, 129131129, 133135133
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OFFSET
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1,1
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LINKS
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EXAMPLE
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109111109 is a term as it is the concatenation of 109, 111 and 109.
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MATHEMATICA
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Select[Table[FromDigits[Join[IntegerDigits[n], IntegerDigits[n+2], IntegerDigits[ n]]], {n, 200}], PrimeQ] (* Harvey P. Dale, Jul 13 2018 *)
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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STATUS
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approved
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