[seqfan] number theory question about A000593
Peter Lawrence
peterl95124 at sbcglobal.net
Sat Jun 18 17:37:14 CEST 2011
I was tinkering with A000593 "sum of odd divisors of N" and noticed
that empirically
A(n) = n+1 IFF isprime(n) <---
conjecture ???
(a bit of finagling results in only needing to check for odd squares,
so a simple C program
verifies this out to 10^12 pretty fast)
So I am wondering if this is actually true, and if so is there is any
N.T. proof.
apologies in advance if this is too off-topic for this list,
thanks,
Peter Lawrence.
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