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A178556
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Primes with exactly seven 7's.
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5
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77767777, 77777177, 77777377, 77777747, 137777777, 172777777, 177677777, 177776777, 177777377, 177777577, 177777727, 177777773, 177777779, 177797777, 197777777, 272777777, 277177777, 277727777, 277771777, 277775777, 277777177
(list;
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listen;
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text;
internal format)
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Prime[Range[45*10^5, 152*10^5]], DigitCount[#, 10, 7]==7&] (* Harvey P. Dale, Dec 20 2022 *)
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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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