[seqfan] Re: Observation on the divisors of 136

Antti Karttunen antti.karttunen at gmail.com
Sun Dec 31 22:03:05 CET 2017

Neil Fernandez wrote in

> Excluding powers of 2, the sequence begins
> 3, 10, 136, 32896
> with no more members less than 10^7.

This is a subsequence of
"Numbers n such that the sum of their divisors + the number of ones in
their binary expansion = 2n", which is just one among many of its
equivalent interpretations.

Best regards,


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