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Search: id:A108632
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| A108632 |
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Semiprimes with prime digits (only digits 2,3,5,7 in semiprimes). |
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+0
2
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| 22, 25, 33, 35, 55, 57, 77, 235, 237, 253, 323, 327, 335, 355, 377, 527, 533, 535, 537, 553, 573, 723, 737, 753, 755, 2227, 2253, 2257, 2323, 2327, 2335, 2353, 2533, 2537, 2573, 2577, 2722, 2723, 2733, 2735, 2757, 2773, 3223, 3227, 3233, 3235, 3273, 3277
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Complement of 108631 in the class of semiprimes.
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MATHEMATICA
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fQ[n_]:=Plus@@Last/@FactorInteger[n]==2&&Union[{2, 3, 5, 7}, IntegerDigits[n]]=={2, 3, 5, 7}; Select[Range[4000], fQ[ # ]&]
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CROSSREFS
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Cf. A108631.
Sequence in context: A092631 A061371 A070809 this_sequence A045096 A124177 A160078
Adjacent sequences: A108629 A108630 A108631 this_sequence A108633 A108634 A108635
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jun 13 2005
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