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Search: id:A134716
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| A134716 |
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a(n) = least number m such that sigma(m)/m > n, where sigma(m) = sum of divisors of m. |
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+0
1
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OFFSET
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0,2
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EXAMPLE
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Values written as products of primorials:
n a(n)
0 1
1 2
2 2*3#
3 3#*5# (= 180)
4 2*3#*11#
5 8*5#*17#
6 16*3#*7#*29#
7 8*3#*3#*7#*53#
8 32*3#*3#*5#*11#*89#
9 32*3#*3#*7#*17#*157#
10 16*3#*3#*5#*7#*23#*271#
11 16*3#*3#*5#*7#*29#*487#
12 16*3#*3#*5#*7#*13#*31#*857#
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CROSSREFS
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Adjacent sequences: A134713 A134714 A134715 this_sequence A134717 A134718 A134719
Sequence in context: A007129 A125861 A067962 this_sequence A006023 A039748 A007764
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KEYWORD
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more,nonn
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AUTHOR
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Pierre CAMI (pierrecami(AT)tele2.fr), Jan 27 2008, corrected Feb 26 2008 with the help of Emeric Deutsch
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EXTENSIONS
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More terms can be obtained by expanding the expressions in the example lines. - njas, Feb 26 2008
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