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Search: id:A111496
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| A111496 |
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4-almost primes with semiprime digits (digits 4, 6, 9 only). |
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+0
7
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| 444, 644, 664, 666, 966, 996, 999, 4444, 4466, 4494, 4696, 4964, 6644, 6666, 6699, 9444, 9496, 9646, 9964, 9966, 9999, 44444, 44499, 44646, 44996, 46444, 46449, 46964, 46996, 49444, 49494, 49946, 49966, 49996, 64446, 64494, 64644, 64666
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(1) = 444 = 2^2 * 3 * 37, a(2) = 644 = 2^2 * 7 * 23, a(3) = 664 = 2^3 * 83, a(4) = 666 = 2 * 3^2 * 37, a(5) = 966 = 2 * 3 * 7 * 23, a(6) = 996 = 2^2 * 3 * 83, a(7) = 999 = 3^3 * 37, a(8) = 4466 = 2 * 7 * 11 * 29, a(9) = 4494 = 2 * 3 * 7 * 107, a(10) = 4696 = 2^3 * 587.
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CROSSREFS
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Cf. A001358, A014613, A107665, A107666, A107342, A111494, A111697.
Sequence in context: A031519 A031699 A098254 this_sequence A128675 A043507 A098255
Adjacent sequences: A111493 A111494 A111495 this_sequence A111497 A111498 A111499
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KEYWORD
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base,easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Nov 16 2005
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