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Search: id:A106550
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| A106550 |
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a(n) = n-th semiprime + (concatenation of its two factors, smallest factor first). |
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+0
5
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| 26, 29, 42, 35, 41, 50, 58, 233, 80, 239, 344, 251, 92, 257, 352, 269, 126, 368, 566, 376, 2, 87, 293, 578, 392, 311, 788, 323, 602, 329, 416, 804, 424, 341, 614, 359, 448, 638, 377, 836, 1232, 383, 464, 472, 852, 401, 488, 413, 1256, 674, 419, 686, 437, 512, 884
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n) = A001358(n) + A106554(n). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 19 2005
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EXAMPLE
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First semiprime is 4; 4 is 2*2; 26=4+22.
Second semiprime is 6; 6 is 2*3; 29=6+23.
Third semiprime is 9; 9 is 3*3; 41=9+33.
Fourth semiprime is 10; 10 is 2*5; 35=10+25.
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CROSSREFS
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Cf. A084126, A084127, A001358.
Sequence in context: A081644 A055109 A106552 this_sequence A069962 A045163 A046292
Adjacent sequences: A106547 A106548 A106549 this_sequence A106551 A106552 A106553
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KEYWORD
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base,easy,nonn
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AUTHOR
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Eric Angelini (eric.angelini(AT)kntv.be), May 09 2005
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EXTENSIONS
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More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 19 2005
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