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Sum of divisors of the numbers n-th number whose divisors increase by a factor of 2 or less.
Also sum of divisors of consider the numbers n-th number k whose with the property that the symmetric representation of sigma(k) has only one part. a(n) is the area of the diagram (see the example). For more information see A237593 and its related sequences.
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<a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a>
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