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A111697
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5-almost primes with semiprime digits (digits 4, 6, 9 only).
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8
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464, 496, 696, 944, 4446, 4496, 4664, 6444, 6669, 6996, 9666, 9944, 44649, 44664, 44694, 44696, 44946, 44964, 46664, 46696, 49446, 49496, 49944, 64664, 66664, 66996, 69464, 69944, 69996, 94996, 96464, 96664, 96996, 99664, 99946, 99996
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(1) = 464 = 2^4 x 29, a(2) = 496 = 2^4 * 31, a(3) = 696 = 2^3 * 3 * 29, a(4) = 944 = 2^4 * 59, a(5) = 4446 = 2 * 3^2 * 13 * 19, a(6) = 4496 = 2^4 * 281, a(7) = 4664 = 2^3 * 11 * 53, a(8) = 6444 = 2^2 * 3^2 * 179, a(9) = 6669 = 3^3 * 13 * 19, a(10) = 6996 = 2^2 * 3 * 11 * 53.
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MATHEMATICA
| Select[Range[100000], PrimeOmega[#]==5&&Union[Drop[Drop[Drop[ DigitCount[ #], {9}], {6}], {4}]]=={0}&] (* From Harvey P. Dale, Oct 03 2011 *)
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CROSSREFS
| Cf. A001358, A014614, A107665, A107666, A107342, A111494, A111496.
Sequence in context: A108834 A189830 A050424 * A116344 A115441 A028383
Adjacent sequences: A111694 A111695 A111696 * A111698 A111699 A111700
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KEYWORD
| base,easy,nonn
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Nov 17 2005
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EXTENSIONS
| Corrected by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 19 2005
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