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A261184
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Primes that contain only the digits (6, 7, 9).
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2
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7, 67, 79, 97, 677, 769, 797, 967, 977, 997, 6679, 6779, 6967, 6977, 6997, 7669, 7699, 9677, 9679, 9697, 9767, 9769, 9967, 66697, 66797, 66977, 67679, 67699, 67777, 67967, 67979, 69677, 69697, 69767, 69779, 69997, 76667, 76679, 76697, 76777, 77699, 77797
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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Select[Prime[Range[6 10^4]], Complement[IntegerDigits[#], {6, 7, 9}] == {} &]
Select[Flatten[Table[FromDigits/@Tuples[{6, 7, 9}, n], {n, 5}]], PrimeQ] (* Harvey P. Dale, Jun 18 2021 *)
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PROG
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(Magma) [p: p in PrimesUpTo(2*10^5) | Set(Intseq(p)) subset [6, 7, 9]];
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CROSSREFS
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Cf. similar sequences listed in A261181.
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KEYWORD
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nonn,easy,base
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AUTHOR
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STATUS
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approved
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