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A101249
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Primes that are a concatenation of 5, 7 and a prime.
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6
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577, 5711, 5717, 5737, 5741, 5743, 5779, 5783, 57107, 57131, 57139, 57149, 57163, 57173, 57179, 57191, 57193, 57223, 57241, 57251, 57269, 57271, 57283, 57331, 57347, 57349, 57367, 57373, 57383, 57389, 57397, 57457, 57467, 57487, 57503
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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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5711 is a prime concatenated from the primes 5,7 and 11.
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MATHEMATICA
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Select[ Table[ FromDigits[ Flatten[ IntegerDigits /@ {5, 7, Prime[n]}]], {n, 100}], PrimeQ[ # ] &] (* Robert G. Wilson v, Dec 20 2004 *)
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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