[seqfan] Re: Sigma_2

[Jack Brennen]

If I'm not mistaken, the number 14641 (11 to the fourth power) is a 
member of A031363,
and also has sigma_2(14641) divisible by 5.



On 3/28/2016 9:40 PM, Frank Adams-Watters wrote:
> Is A031363 the set of all numbers n such that sigma_2(n) is not divisible by 5? If not, where is the first difference?
>
> Franklin T. Adams-Watters
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