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A107665
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Numbers with semiprime digits (digits 4, 6, 9 only).
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8
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4, 6, 9, 44, 46, 49, 64, 66, 69, 94, 96, 99, 444, 446, 449, 464, 466, 469, 494, 496, 499, 644, 646, 649, 664, 666, 669, 694, 696, 699, 944, 946, 949, 964, 966, 969, 994, 996, 999, 4444, 4446, 4449, 4464, 4466, 4469, 4494, 4496, 4499, 4644, 4646, 4649, 4664
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| Select[Range[5000], Union[Pick[DigitCount[#], {1, 1, 1, 0, 1, 0, 1, 1, 0, 1}, 1]] == {0}&] (* From Harvey P. Dale, Oct 21 2011 *)
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CROSSREFS
| Cf. A107666 (primes in this sequence), A001358 (semiprimes), A029581 (all digits are composite).
Cf. A107342, A111494, A111496, A111697.
Sequence in context: A081614 A192220 A175459 * A085733 A107342 A086698
Adjacent sequences: A107662 A107663 A107664 * A107666 A107667 A107668
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KEYWORD
| base,nonn
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AUTHOR
| Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 19 2005
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