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Search: id:A106551
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| A106551 |
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a(n) = n-th semiprime + (concatenation of its two divisors, largest divisor first). |
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+0
1
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| 26, 38, 41, 62, 86, 65, 94, 134, 80, 158, 146, 206, 110, 230, 172, 278, 128, 224, 170, 250
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Concatenation of the divisors starting with the smallest one leads to a different sequence.
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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 3*2; 38=6+32.
Third semiprime is 9; 9 is 3*3; 41=9+33.
Fourth semiprime is 10; 10 is 5*2; 62=10+52.
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CROSSREFS
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Sequence in context: A138065 A034096 A034106 this_sequence A106553 A045092 A039324
Adjacent sequences: A106548 A106549 A106550 this_sequence A106552 A106553 A106554
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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), Sep 29 2007
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