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Search: id:A106557
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| A106557 |
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Largest number that can be obtained by concatenating the two factors of the n-th semiprime. |
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+0
1
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| 22, 32, 33, 52, 72, 53, 73, 211, 55, 213, 311, 217, 75, 219, 313, 232, 77, 317, 511, 319, 292
(list; graph; listen)
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OFFSET
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22,1
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EXAMPLE
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First semiprime is 4; 4 is 2*2 -> 22.
Second semiprime is 6; 6 is 3*2 -> 32 (and not 23).
...
Eighth semiprime is 22; 22 is 2*11 -> 211 (and not 112).
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CROSSREFS
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Sequence in context: A129073 A092215 A106555 this_sequence A142347 A121019 A167337
Adjacent sequences: A106554 A106555 A106556 this_sequence A106558 A106559 A106560
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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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Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 14 2008
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